Mystery of the Missing Vibrations
A tuning fork makes 512 vibrations in 2 seconds. Find its frequency
256 Hz
Three tiny bones in the ear that amplify vibrations.
ear ossicles-Incus, Malleus and Stapes
Sounds above 20,000 Hz.
ultrasound
Reflection of sound heard later.
echo
Unit of sound intensity level.
Decibel
The speed of sound in air is 340 m/s. If the time taken to hear the echo is 0.2 seconds, find the distance of the reflecting wall
34 m
The time taken for one oscillation
Time period
Persistence of sound due to multiple reflections.
Reverberation
More of this medium property slows down sound.
density
Device used to measure loudness levels.
Decibelmeter
A sound wave has a frequency of 220 Hz and its wavelength is 1.5 m.
Calculate the speed of the sound wave
Medium property that helps regain original shape.
Elasticity
Sound cannot travel in this.
vacuum
Device used for underwater depth measurement.
SONAR
Process of reducing unwanted sound in buildings.
Soundproofing
ship uses SONAR and receives the echo after 4 seconds. If the speed of sound in water is 1500 m/s, find the depth of the sea.
3000 m
The condition caused by prolonged exposure to loud sounds.
deafness
Part of the ear that contains sensory hair cells.
cochlea
Method used by bats to locate obstacles.
Echolocation
Harmful, unpleasant, and unwanted sound is called ____.
noise (you)
A sound wave travels 660 m in 2 seconds. If its frequency is 330 Hz, find its wavelength.
1 m
The quantity equal to frequency × wavelength.
velocity or speed
The minimum distance required for an echo.
17.2 m
The tube connecting the middle ear to the throat
Eustachian tube
The symbol of wavelength is
lambda