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 12
A person hears thunder 5 seconds after seeing lightning. If the speed of sound in air is 340 m/s, how far away is the lightning?
A sound wave has a frequency of 500 Hz and a wavelength of 0.68 m. Calculate the speed of sound in the medium.
A sound wave travels 660 m in 2 seconds. What is its speed?
A submarine uses sonar to detect an object underwater. The sound pulse returns after 4 seconds. If the speed of sound in water is 1500 m/s, how far is the object from the submarine?
Describe the effect of humidity on the speed of sound in air.
Describe what happens to the speed of sound as the density of a gas increases, assuming elasticity remains constant.
Explain why sound cannot be heard on the Moon.
Explain why sound is not heard instantly when a distant explosion occurs.
Explain why sound travels faster in solids than in gases.
Explain why sound waves are called mechanical waves.
If the speed of sound in a medium is 1500 m/s and its frequency is 300 Hz, what is its wavelength?
State the relationship between the speed of sound, its frequency, and wavelength.
State two reasons why sound travels faster in warm air than in cold air.
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 E increases and ρ remains constant, what happens to the speed of sound?
