Sound Propagation
Physics ⇒ Waves and Sound
Sound Propagation starts at 7 and continues till grade 12.
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See sample questions for grade 11
A person shouts near a cliff and hears the echo after 2 seconds. If the speed of sound in air is 340 m/s, how far is the cliff from the person?
A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. What is the speed of sound in the medium?
A sound wave has a wavelength of 1.7 m and a speed of 340 m/s. What is its frequency?
A sound wave travels 1700 meters in 5 seconds. What is the speed of sound in this case?
Describe the process of echo formation.
Describe what happens to the amplitude of a sound wave as it propagates through a medium.
Explain why astronauts cannot hear each other on the moon without radios.
Explain why sound travels faster in solids than in gases.
Explain why thunder is heard after lightning is seen during a storm.
If the distance between a source of sound and a listener is doubled, what happens to the intensity of the sound?
If the frequency of a sound wave increases but its speed remains constant, what happens to its wavelength?
State the relationship between frequency, wavelength, and speed of sound.
The speed of sound in a medium is given by v = √(E/ρ), where E is the modulus of elasticity and ρ is the density. If the density increases and elasticity remains constant, what happens to the speed of sound?
What is the main reason why sound is not heard clearly around a corner?
A sound wave of frequency 1000 Hz travels through a solid where its speed is 5000 m/s. Calculate its wavelength in the solid.
A sound wave travels a distance of 660 meters in 2 seconds in a certain medium. If the frequency of the wave is 330 Hz, what is its wavelength?
A sound wave travels from air into water. Describe and explain what happens to its speed, wavelength, and frequency as it enters the water.
A submarine emits a sonar pulse that travels through seawater (speed of sound = 1500 m/s) and reflects off an object. If the echo returns after 4 seconds, how far is the object from the submarine?
A train is moving towards a stationary observer at a speed of 30 m/s. If the speed of sound in air is 340 m/s and the train's whistle emits a frequency of 500 Hz, what frequency does the observer hear? (Assume the observer is stationary and wind speed is negligible.)
Explain why sound waves are classified as mechanical waves and not electromagnetic waves.
