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11TH GRADE PRACTICE

Physics Problems: Oscillations and waves, Grade 11

Mechanical, electromagnetic vibrations and wave connections.

30 problems3 subtopics
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CONDITIONS

Problems

30
№ 12

Problem 12

Mechanical vibrations

Determine the period and frequency of a string pendulum of length 1 m1\,\text{m}. How many oscillations will he make for 30 s30\,\text{s}?

  1. (20 s; 5 Gts; 150 kolebaniy)\left(20\,\text{s};\ 5\,\text{Gts};\ 150\,\text{kolebaniy}\right)
  2. (2 s; 0,5 Gts; 15 kolebaniy)\left(2\,\text{s};\ 0{,}5\,\text{Gts};\ 15\,\text{kolebaniy}\right)
  3. (1 s; 0,25 Gts; 7,5 kolebaniy)\left(1\,\text{s};\ 0{,}25\,\text{Gts};\ 7{,}5\,\text{kolebaniy}\right)
  4. (4 s; 1 Gts; 30 kolebaniy)\left(4\,\text{s};\ 1\,\text{Gts};\ 30\,\text{kolebaniy}\right)
№ 13

Problem 13

Mechanical vibrations

The weight of the spring pendulum is 40 g40\,\text{g}, the spring stiffness is 20 N/m20\,\text{N/m}. Determine the period, frequency and time of 2525 oscillations.

  1. (0,56 s; 7,12 Gts; 14 s)\left(0{,}56\,\text{s};\ 7{,}12\,\text{Gts};\ 14\,\text{s}\right)
  2. (2,8 s; 35,6 Gts; 70 s)\left(2{,}8\,\text{s};\ 35{,}6\,\text{Gts};\ 70\,\text{s}\right)
  3. (0,28 s; 3,56 Gts; 7 s)\left(0{,}28\,\text{s};\ 3{,}56\,\text{Gts};\ 7\,\text{s}\right)
  4. (0,14 s; 1,78 Gts; 3,5 s)\left(0{,}14\,\text{s};\ 1{,}78\,\text{Gts};\ 3{,}5\,\text{s}\right)
№ 14

Problem 14

Mechanical vibrations

When a load weighing 800 g800\,\text{g} was suspended from a spring, it stretched by 2 cm2\,\text{cm}. Determine the frequency of vibration of the load.

  1. 1,78 Gts1{,}78\,\text{Gts}
  2. 7,12 Gts7{,}12\,\text{Gts}
  3. 35,6 Gts35{,}6\,\text{Gts}
  4. 3,56 Gts3{,}56\,\text{Gts}
№ 15

Problem 15

Mechanical vibrations

For 5 s5\,\text{s} the spring pendulum made 88 oscillations. Determine the mass of the load if the spring stiffness is 25 N/m25\,\text{N/m}. Is there enough data to find the path in the first 0,1 s0{,}1\,\text{s} at an amplitude of 10 cm10\,\text{cm}?

  1. (0,25 kg; dlya puti nuzhna nachalnaya faza)\left(0{,}25\,\text{kg};\ \text{dlya puti nuzhna nachalnaya faza}\right)
  2. (0,40 kg; 0,10 m)\left(0{,}40\,\text{kg};\ 0{,}10\,\text{m}\right)
  3. (0,25 kg; 0,20 m)\left(0{,}25\,\text{kg};\ 0{,}20\,\text{m}\right)
  4. (1 kg; dlya puti dannykh dostatochno)\left(1\,\text{kg};\ \text{dlya puti dannykh dostatochno}\right)
№ 16

Problem 16

Mechanical vibrations

A load of mass 2 kg2\,\text{kg} oscillates on a spring of stiffness 50 N/m50\,\text{N/m} with an amplitude of 5 cm5\,\text{cm}. Determine possible coordinates in terms of 0,15 s0{,}15\,\text{s} for two standard initial phases and the velocity at point x=2 cmx=2\,\text{cm}.

  1. (0,365 m; 0,341 m; 2,3 m/s)\left(0{,}365\,\text{m};\ 0{,}341\,\text{m};\ 2{,}3\,\text{m/s}\right)
  2. (0,0365 m; 0,0341 m; 0,23 m/s)\left(0{,}0365\,\text{m};\ 0{,}0341\,\text{m};\ 0{,}23\,\text{m/s}\right)
  3. (0,01825 m; 0,01705 m; 0,115 m/s)\left(0{,}01825\,\text{m};\ 0{,}01705\,\text{m};\ 0{,}115\,\text{m/s}\right)
  4. (0,073 m; 0,0682 m; 0,46 m/s)\left(0{,}073\,\text{m};\ 0{,}0682\,\text{m};\ 0{,}46\,\text{m/s}\right)
№ 17

Problem 17

Electromagnetic vibrations

A capacitor with a capacity of 125 pF125\,\text{pF} is charged to 400 V400\,\text{V} and is connected to a coil with an inductance of 20 mH20\,\text{mH}. Determine the period, frequency and cyclic frequency, maximum charge and current, write down the dependences q(t)q(t), u(t)u(t) and i(t)i(t).

  1. (6,28⋅10−7 s; 6,4⋅106 Gts; 4⋅107 rad/s; 1⋅10−7 Kl; 2 A)\left(6{,}28 \cdot 10^{-7}\,\text{s};\ 6{,}4 \cdot 10^{6}\,\text{Gts};\ 4 \cdot 10^{7}\,\text{rad/s};\ 1 \cdot 10^{-7}\,\text{Kl};\ 2\,\text{A}\right)
  2. (3,14⋅10−6 s; 3,2⋅107 Gts; 2⋅108 rad/s; 5⋅10−7 Kl; 10 A)\left(3{,}14 \cdot 10^{-6}\,\text{s};\ 3{,}2 \cdot 10^{7}\,\text{Gts};\ 2 \cdot 10^{8}\,\text{rad/s};\ 5 \cdot 10^{-7}\,\text{Kl};\ 10\,\text{A}\right)
  3. (3,14⋅10−7 s; 3,2⋅106 Gts; 2⋅107 rad/s; 5⋅10−8 Kl; 1 A)\left(3{,}14 \cdot 10^{-7}\,\text{s};\ 3{,}2 \cdot 10^{6}\,\text{Gts};\ 2 \cdot 10^{7}\,\text{rad/s};\ 5 \cdot 10^{-8}\,\text{Kl};\ 1\,\text{A}\right)
  4. (1,57⋅10−7 s; 1,6⋅106 Gts; 1⋅107 rad/s; 2,5⋅10−8 Kl; 0,5 A)\left(1{,}57 \cdot 10^{-7}\,\text{s};\ 1{,}6 \cdot 10^{6}\,\text{Gts};\ 1 \cdot 10^{7}\,\text{rad/s};\ 2{,}5 \cdot 10^{-8}\,\text{Kl};\ 0{,}5\,\text{A}\right)
№ 18

Problem 18

Electromagnetic vibrations

According to what law do the voltage in the lighting network and the current in the 500 Ohm500\,\text{Ohm} resistor, connected to this 220 V220\,\text{V}, 50 Hz50\,\text{Hz} network change?

  1. (155,5 V; 0,31 A; 157 rad/s)\left(155{,}5\,\text{V};\ 0{,}31\,\text{A};\ 157\,\text{rad/s}\right)
  2. (622 V; 1,24 A; 628 rad/s)\left(622\,\text{V};\ 1{,}24\,\text{A};\ 628\,\text{rad/s}\right)
  3. (3110 V; 6,2 A; 3140 rad/s)\left(3110\,\text{V};\ 6{,}2\,\text{A};\ 3140\,\text{rad/s}\right)
  4. (311 V; 0,62 A; 314 rad/s)\left(311\,\text{V};\ 0{,}62\,\text{A};\ 314\,\text{rad/s}\right)
№ 19

Problem 19

Electromagnetic vibrations

A 80 uF80\,\text{uF} capacitor was connected to a 220 V220\,\text{V}, 50 Hz50\,\text{Hz} network. Determine the amplitude voltage and current, as well as the law of change of current. What inductance must be connected in series for resonance?

  1. (311 V; 7,8 A; 0,126 Gn)\left(311\,\text{V};\ 7{,}8\,\text{A};\ 0{,}126\,\text{Gn}\right)
  2. (155,5 V; 3,9 A; 0,063 Gn)\left(155{,}5\,\text{V};\ 3{,}9\,\text{A};\ 0{,}063\,\text{Gn}\right)
  3. (622 V; 15,6 A; 0,252 Gn)\left(622\,\text{V};\ 15{,}6\,\text{A};\ 0{,}252\,\text{Gn}\right)
  4. (3110 V; 78 A; 1,26 Gn)\left(3110\,\text{V};\ 78\,\text{A};\ 1{,}26\,\text{Gn}\right)
№ 20

Problem 20

Electromagnetic vibrations

The capacitor was given a charge of 4⋅10−4 Cl4\cdot10^{-4}\,\text{Cl} and shorted to the coil. Capacitance 5 uF5\,\text{uF}, inductance 32 mH32\,\text{mH}. Determine the cyclic frequency, voltage and current amplitudes and the laws of their change.

  1. (25000 rad/s; 800 V; 10 A)\left(25000\,\text{rad/s};\ 800\,\text{V};\ 10\,\text{A}\right)
  2. (2500 rad/s; 80 V; 1 A)\left(2500\,\text{rad/s};\ 80\,\text{V};\ 1\,\text{A}\right)
  3. (1250 rad/s; 40 V; 0,5 A)\left(1250\,\text{rad/s};\ 40\,\text{V};\ 0{,}5\,\text{A}\right)
  4. (5000 rad/s; 160 V; 2 A)\left(5000\,\text{rad/s};\ 160\,\text{V};\ 2\,\text{A}\right)
№ 21

Problem 21

Electromagnetic vibrations

In an oscillatory circuit, the frequency is 2⋅105 Hz2\cdot10^{5}\,\text{Hz}, the inductance is 1,5 mH1{,}5\,\text{mH}, the current amplitude is 0,2 A0{,}2\,\text{A}. Determine the capacitance and voltage amplitude.

  1. (8,4⋅10−10 F; 756 V)\left(8{,}4 \cdot 10^{-10}\,\text{F};\ 756\,\text{V}\right)
  2. (4,2⋅10−9 F; 3780 V)\left(4{,}2 \cdot 10^{-9}\,\text{F};\ 3780\,\text{V}\right)
  3. (4,2⋅10−10 F; 378 V)\left(4{,}2 \cdot 10^{-10}\,\text{F};\ 378\,\text{V}\right)
  4. (2,1⋅10−10 F; 189 V)\left(2{,}1 \cdot 10^{-10}\,\text{F};\ 189\,\text{V}\right)
№ 22

Problem 22

Electromagnetic vibrations

A capacitor is connected to an alternating current circuit with a voltage of 24 V24\,\text{V} and a frequency of 200 Hz200\,\text{Hz}. What is its capacity if the current is 0,8 A0{,}8\,\text{A}?

  1. 1,325⋅10−5 F1{,}325 \cdot 10^{-5}\,\text{F}
  2. 5,3⋅10−5 F5{,}3 \cdot 10^{-5}\,\text{F}
  3. 2,65⋅10−4 F2{,}65 \cdot 10^{-4}\,\text{F}
  4. 2,65⋅10−5 F2{,}65 \cdot 10^{-5}\,\text{F}
№ 23

Problem 23

Electromagnetic vibrations

A steel conductor with a length of 10 m10\,\text{m} and a cross-section of 0,6 mm20{,}6\,\text{mm}^{2} is connected to an alternating current circuit with a voltage of 12 V12\,\text{V} and a frequency of 400 Hz400\,\text{Hz}. Determine the amplitudes of voltage and current and the law of their change.

  1. (17 V; 8,5 A; 2512 rad/s)\left(17\,\text{V};\ 8{,}5\,\text{A};\ 2512\,\text{rad/s}\right)
  2. (8,5 V; 4,25 A; 1256 rad/s)\left(8{,}5\,\text{V};\ 4{,}25\,\text{A};\ 1256\,\text{rad/s}\right)
  3. (34 V; 17 A; 5024 rad/s)\left(34\,\text{V};\ 17\,\text{A};\ 5024\,\text{rad/s}\right)
  4. (170 V; 85 A; 25120 rad/s)\left(170\,\text{V};\ 85\,\text{A};\ 25120\,\text{rad/s}\right)
№ 24

Problem 24

Electromagnetic vibrations

An inductance coil 0,03 H0{,}03\,\text{H} is connected to an alternating current circuit. What is the frequency if the voltage is 12 V12\,\text{V} and the current is 5 A5\,\text{A}?

  1. 127 Gts127\,\text{Gts}
  2. 12,7 Gts12{,}7\,\text{Gts}
  3. 6,35 Gts6{,}35\,\text{Gts}
  4. 25,4 Gts25{,}4\,\text{Gts}
№ 25

Problem 25

Waves

For 5 s5\,\text{s}, a mosquito's wings make 20002000 oscillations. Determine the frequency and period, as well as the length of the sound wave at a speed of 340 m/s340\,\text{m/s}.

  1. (800 Gts; 0,005 s; 1,7 m)\left(800\,\text{Gts};\ 0{,}005\,\text{s};\ 1{,}7\,\text{m}\right)
  2. (4000 Gts; 0,025 s; 8,5 m)\left(4000\,\text{Gts};\ 0{,}025\,\text{s};\ 8{,}5\,\text{m}\right)
  3. (400 Gts; 0,0025 s; 0,85 m)\left(400\,\text{Gts};\ 0{,}0025\,\text{s};\ 0{,}85\,\text{m}\right)
  4. (200 Gts; 0,00125 s; 0,425 m)\left(200\,\text{Gts};\ 0{,}00125\,\text{s};\ 0{,}425\,\text{m}\right)
№ 26

Problem 26

Waves

The period of oscillations in the wave is 0,16 s0{,}16\,\text{s}, the wave speed is 3 m/s3\,\text{m/s}. Determine the length, frequency and time of 2525 oscillations.

  1. (0,24 m; 3,125 Gts; 2 s)\left(0{,}24\,\text{m};\ 3{,}125\,\text{Gts};\ 2\,\text{s}\right)
  2. (0,96 m; 12,5 Gts; 8 s)\left(0{,}96\,\text{m};\ 12{,}5\,\text{Gts};\ 8\,\text{s}\right)
  3. (4,8 m; 62,5 Gts; 40 s)\left(4{,}8\,\text{m};\ 62{,}5\,\text{Gts};\ 40\,\text{s}\right)
  4. (0,48 m; 6,25 Gts; 4 s)\left(0{,}48\,\text{m};\ 6{,}25\,\text{Gts};\ 4\,\text{s}\right)
№ 27

Problem 27

Waves

The observer saw lightning, and 50 s50\,\text{s} later heard thunder. How long can a thunderstorm be expected if the wind speed is 20 m/s20\,\text{m/s} and the speed of sound is 340 m/s340\,\text{m/s}?

  1. (17000 m; 850 s)\left(17000\,\text{m};\ 850\,\text{s}\right)
  2. (8500 m; 425 s)\left(8500\,\text{m};\ 425\,\text{s}\right)
  3. (34000 m; 1700 s)\left(34000\,\text{m};\ 1700\,\text{s}\right)
  4. (1,7⋅105 m; 8500 s)\left(1{,}7 \cdot 10^{5}\,\text{m};\ 8500\,\text{s}\right)
№ 28

Problem 28

Waves

Two common mode generators operate at a frequency of 1,5 MHz1{,}5\,\text{MHz}. What is the result of interference at a point for which the path difference is 650 m650\,\text{m}?

  1. Δr=6,5λ, Arez=A\Delta r=6{,}5\lambda,\ A_{\text{rez}}=A
  2. Δr=3,25λ, Arez=2A\Delta r=3{,}25\lambda,\ A_{\text{rez}}=\sqrt2 A
  3. Δr=3λ, Arez=2A\Delta r=3\lambda,\ A_{\text{rez}}=2A
  4. Δr=3,5λ, Arez=0\Delta r=3{,}5\lambda,\ A_{\text{rez}}=0
№ 29

Problem 29

Waves

The wavelength of the Krasnoyarsk radio station is 1,5 km1{,}5\,\text{km}. What is the frequency and how many oscillations occur in 0,2 ms0{,}2\,\text{ms}? What is the frequency of a sound wave with period 0,2 ms0{,}2\,\text{ms}?

  1. (4⋅105 Gts; 80 kolebaniy; 10000 Gts)\left(4 \cdot 10^{5}\,\text{Gts};\ 80\,\text{kolebaniy};\ 10000\,\text{Gts}\right)
  2. (2⋅106 Gts; 400 kolebaniy; 50000 Gts)\left(2 \cdot 10^{6}\,\text{Gts};\ 400\,\text{kolebaniy};\ 50000\,\text{Gts}\right)
  3. (2⋅105 Gts; 40 kolebaniy; 5000 Gts)\left(2 \cdot 10^{5}\,\text{Gts};\ 40\,\text{kolebaniy};\ 5000\,\text{Gts}\right)
  4. (1⋅105 Gts; 20 kolebaniy; 2500 Gts)\left(1 \cdot 10^{5}\,\text{Gts};\ 20\,\text{kolebaniy};\ 2500\,\text{Gts}\right)
№ 30

Problem 30

Waves

Distance to plane 15 km15\,\text{km}. How long does it take for an electromagnetic pulse to travel to the plane and back?

  1. 5⋅10−5 s5 \cdot 10^{-5}\,\text{s}
  2. 2⋅10−4 s2 \cdot 10^{-4}\,\text{s}
  3. 0,001 s0{,}001\,\text{s}
  4. 1⋅10−4 s1 \cdot 10^{-4}\,\text{s}
№ 31

Problem 31

Waves

The radar operates at a wavelength of 6 cm6\,\text{cm} and emits 12501250 pulses per second with a duration of 4 μs4\,\text{μs}. How many oscillations does a pulse contain and what is the longest reconnaissance range?

  1. (20000 kolebaniy; 1,2⋅105 m)\left(20000\,\text{kolebaniy};\ 1{,}2 \cdot 10^{5}\,\text{m}\right)
  2. (10000 kolebaniy; 60000 m)\left(10000\,\text{kolebaniy};\ 60000\,\text{m}\right)
  3. (40000 kolebaniy; 2,4⋅105 m)\left(40000\,\text{kolebaniy};\ 2{,}4 \cdot 10^{5}\,\text{m}\right)
  4. (2⋅105 kolebaniy; 1,2⋅106 m)\left(2 \cdot 10^{5}\,\text{kolebaniy};\ 1{,}2 \cdot 10^{6}\,\text{m}\right)
№ 32

Problem 32

Waves

What wavelength is the receiver tuned to if the oscillating circuit has a capacitance of 40 pF40\,\text{pF} and an inductance of 22,5 μH22{,}5\,\text{μH}?

  1. 565,2 m565{,}2\,\text{m}
  2. 56,52 m56{,}52\,\text{m}
  3. 28,26 m28{,}26\,\text{m}
  4. 113,04 m113{,}04\,\text{m}
№ 33

Problem 33

Waves

The distance between the nodes of a standing electromagnetic wave is 12 m12\,\text{m}. What are the wavelength and frequency?

  1. (48 m; 2,5⋅107 Gts)\left(48\,\text{m};\ 2{,}5 \cdot 10^{7}\,\text{Gts}\right)
  2. (240 m; 1,25⋅108 Gts)\left(240\,\text{m};\ 1{,}25 \cdot 10^{8}\,\text{Gts}\right)
  3. (24 m; 1,25⋅107 Gts)\left(24\,\text{m};\ 1{,}25 \cdot 10^{7}\,\text{Gts}\right)
  4. (12 m; 6,25⋅106 Gts)\left(12\,\text{m};\ 6{,}25 \cdot 10^{6}\,\text{Gts}\right)
№ 34

Problem 34

Waves

For 20 s20\,\text{s} the string makes 80008000 vibrations. How will a sound wave behave when it encounters an obstacle of size 2 m2\,\text{m}?

  1. (40 Gts; 8,5 m; tolko ofrazhenie)\left(40\,\text{Gts};\ 8{,}5\,\text{m};\ \text{tolko ofrazhenie}\right)
  2. (8000 Gts; 0,0425 m; usefulnoe pogloshchenie)\left(8000\,\text{Gts};\ 0{,}0425\,\text{m};\ \text{usefulnoe pogloshchenie}\right)
  3. (200 Gts; 1,7 m; prelomlenie)\left(200\,\text{Gts};\ 1{,}7\,\text{m};\ \text{prelomlenie}\right)
  4. (400 Gts; 0,85 m; volna ogibaet prepyatstvie)\left(400\,\text{Gts};\ 0{,}85\,\text{m};\ \text{volna ogibaet prepyatstvie}\right)
№ 35

Problem 35

Waves

Two common-mode electromagnetic wave generators operate at a frequency of 2,5⋅108 Hz2{,}5\cdot10^{8}\,\text{Hz}. What is the result of interference at a point with a path difference of 3 m3\,\text{m}?

  1. Δr=5λ2, minimum\Delta r=5\dfrac{\lambda}{2},\ \text{minimum}
  2. Δr=5λ, maksimum\Delta r=5\lambda,\ \text{maksimum}
  3. Δr=2λ, maksimum\Delta r=2\lambda,\ \text{maksimum}
  4. Δr=3λ2, maksimum\Delta r=3\dfrac{\lambda}{2},\ \text{maksimum}
№ 36

Problem 36

Waves

What maximum frequency should radar pulses follow when reconnaissance of targets up to 150 km150\,\text{km}?

  1. 10000 Gts10000\,\text{Gts}
  2. 1000 Gts1000\,\text{Gts}
  3. 500 Gts500\,\text{Gts}
  4. 2000 Gts2000\,\text{Gts}
№ 39

Problem 39

Waves

What is one light year equal to?

  1. 9,5⋅1015 m9{,}5 \cdot 10^{15}\,\text{m}
  2. 4,75⋅1015 m4{,}75 \cdot 10^{15}\,\text{m}
  3. 1,9⋅1016 m1{,}9 \cdot 10^{16}\,\text{m}
  4. 9,5⋅1016 m9{,}5 \cdot 10^{16}\,\text{m}
№ 40

Problem 40

Waves

How long does light take from the Sun to Pluto if the distance is 40 AU40\,\text{AU}?

  1. 55,6 ch55{,}6\,\text{ch}
  2. 5,56 ch5{,}56\,\text{ch}
  3. 2,78 ch2{,}78\,\text{ch}
  4. 11,12 ch11{,}12\,\text{ch}
№ 50

Problem 50

Waves

How do the wavelength, frequency and speed of red light change when passing from air to glass with n=1,5n=1{,}5, if λair=8⋅10−7 m\lambda_{\text{air}}=8\cdot10^{-7}\,\text{m}?

  1. (2,665⋅10−7 m; 1,875⋅1014 Gts; 1⋅108 m/s)\left(2{,}665 \cdot 10^{-7}\,\text{m};\ 1{,}875 \cdot 10^{14}\,\text{Gts};\ 1 \cdot 10^{8}\,\text{m/s}\right)
  2. (1,066⋅10−6 m; 7,5⋅1014 Gts; 4⋅108 m/s)\left(1{,}066 \cdot 10^{-6}\,\text{m};\ 7{,}5 \cdot 10^{14}\,\text{Gts};\ 4 \cdot 10^{8}\,\text{m/s}\right)
  3. (5,33⋅10−6 m; 3,75⋅1015 Gts; 2⋅109 m/s)\left(5{,}33 \cdot 10^{-6}\,\text{m};\ 3{,}75 \cdot 10^{15}\,\text{Gts};\ 2 \cdot 10^{9}\,\text{m/s}\right)
  4. (5,33⋅10−7 m; 3,75⋅1014 Gts; 2⋅108 m/s)\left(5{,}33 \cdot 10^{-7}\,\text{m};\ 3{,}75 \cdot 10^{14}\,\text{Gts};\ 2 \cdot 10^{8}\,\text{m/s}\right)
№ 51

Problem 51

Waves

The wavelength of light in water is 450 nm450\,\text{nm}. What is the frequency, wavelength in air and color of the rays? Take nwater=1,33n_{\text{water}}=1{,}33.

  1. (5⋅1014 Gts; 600 nm; oranzhevyy)\left(5\cdot10^{14}\,\text{Gts};\ 600\,\text{nm};\ \text{oranzhevyy}\right)
  2. (6,7⋅1014 Gts; 450 nm; siniy)\left(6{,}7\cdot10^{14}\,\text{Gts};\ 450\,\text{nm};\ \text{siniy}\right)
  3. (5⋅1014 Gts; 338 nm; ulfrafiolet)\left(5\cdot10^{14}\,\text{Gts};\ 338\,\text{nm};\ \text{ulfrafiolet}\right)
  4. (3⋅108 Gts; 600 nm; krasnyy)\left(3\cdot10^{8}\,\text{Gts};\ 600\,\text{nm};\ \text{krasnyy}\right)
№ 53

Problem 53

Waves

Determine the frequency of radiation with wavelength 1,5⋅10−7 m1{,}5\cdot10^{-7}\,\text{m}. What is the physical meaning of frequency?

  1. 4⋅1015 Gts4 \cdot 10^{15}\,\text{Gts}
  2. 2⋅1016 Gts2 \cdot 10^{16}\,\text{Gts}
  3. 2⋅1015 Gts2 \cdot 10^{15}\,\text{Gts}
  4. 1⋅1015 Gts1 \cdot 10^{15}\,\text{Gts}

THEORY

Lessons on the topic

Mechanical vibrationsPeriod, frequency, phase, speed, acceleration and energy.Electromagnetic vibrations and alternating currentOscillatory circuit, reactance and transformer.WavesLength, speed, frequency, phase and reflected signal.

DIRECTORY

Formulas by topic

AmplitudeA, xₘ · mSpring stiffnessk · N/mPeriodT · withSpeedv · m/sFrequencyν · HzCyclic frequencyω · s⁻¹EnergyE, W · J