Advertisements
Advertisements
Question
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
Advertisements
Solution
1) For first sound, f = 256 Hz and λ = 1.3 m
We know that
Speed v = f x λ = 256 x 1.3
→ v = 332.8 m s-1
Thus, the sound travels with a speed of 332.8 m s-1
2) For the second case, λ = 2.6 m and v = 332.8 m s-1
Frequency, f = `v/lambda = 332.8/2.6`
→ f = 128 Hz
The frequency of the first sound is more that of the second sound.
∴ The first sound will be shriller than the second sound
APPEARS IN
RELATED QUESTIONS
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
Define amplitude term in relation to a wave.
What is the condition necessary for an echo to be heard distinctly?
Write the approximate value of the speed of sound in water.
How are bats able to fly in the dark?
What do you understand by the ‘Echolocation system of Dolphins’?
State two factors on which the natural frequency of a body depends.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
