Advertisements
Advertisements
प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
Advertisements
उत्तर
Audible range of hearing for a normal human ear is 20 Hz to 20,000 Hz.
Speed of sound in air, v = 330 ms-1
Speed, wavelength and frequency are related as
v = nλ
`:. lambda = v/n`
nlower = 20 Hz
nupper = 20,000 Hz
`:. lambda_"lower" = v/(n_"lower")`
`:.lambda_"lower" = 330/20 = 16.5 m`
Similary `lambda_"upper" = v/n_"upper"`
`:. lambda_"upper" = 330/20000` = 0.0165 m = 16.5 mm
APPEARS IN
संबंधित प्रश्न
Define frequency term in relation to a wave.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
What are infrasonic waves?
What do you understand by the ‘Echolocation system of Dolphins’?
What are fishing boats?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
What is meant by an echo? Explain.
