Sound — Practice Quiz
Maharashtra Board · Class 11 · Physics
Try a 4-question quiz on Sound for Maharashtra Board Class 11 Physics: tap an answer to check it and see why. 43 questions in the full chapter test.
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Quick Quiz: Sound
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What type of wave is a sound wave in air?
The speed of sound in air at 20°C is 343 m/s. What will be the wavelength of a sound wave of frequency 256 Hz?
According to Laplace's correction, the speed of sound in air is given by:
A person hears an echo 2 seconds after shouting towards a cliff. If the speed of sound is 340 m/s, what is the distance to the cliff?
Sample Questions
Which of the following factors affect the speed of sound in air?
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Temperature, Humidity
Speed of sound increases with temperature (v ∝ √T) and humidity (moist air is less dense). At constant temperature, pressure doesn't affect sound speed in ideal gases. Frequency and amplitude don't affect wave speed in a given medium.
The minimum distance required between a listener and a reflecting surface to hear a distinct echo is approximately:
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17 m
For distinct echo, the time interval should be at least 0.1 s (persistence of sound in brain). At 22°C, v = 344 m/s. Distance for echo = (v × t)/2 = (344 × 0.1)/2 = 17.2 m ≈ 17 m.
Which of the following are characteristics of longitudinal waves?
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Particles vibrate parallel to wave direction, Can travel through solids, liquids, and gases, Cannot be polarized
Longitudinal waves have particle vibrations parallel to wave propagation, can travel through all material media, and cannot be polarized. They have compressions and rarefactions (not crests/troughs) and need a medium to travel.
The speed of sound increases with temperature because:
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Kinetic energy of air molecules increases
Speed of sound v ∝ √T. As temperature increases, kinetic energy of air molecules increases, making them move faster and transmit sound waves more quickly through the medium.
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