Advertisements
Advertisements
प्रश्न
Establish the relationship between the speed of sound, its wavelength and frequency. If the velocity of sound in air is 340 m s–1, calculate
(i) wavelength when the frequency is 256 Hz.
(ii) frequency when the wavelength is 0.85 m
Advertisements
उत्तर
Speed of sound is the distance travelled by the sound wave per unit time.
Distance travelled by sound wave in periodic time (T) = wavelength (λ) of the sound wave.
Thus, speed of sound, v = `"distance(λ)"/("time taken (T)")`
or v = `λ/"T"`
∵ frequency, v = `1/"T"`
thus v = u
The velocity of sound in air, v = 340 ms−1
(i) Frequency, u = 256 Hz
∴ The wavelength, λ = `"v"/"v" = 340/256 "m"`
= 1.33 M
(ii) Wavelength, λ = 0.85 m
∴ Frequency v = `"v"/λ = 340/0.85 "Hz"`
= 400 Hz
APPEARS IN
संबंधित प्रश्न
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
Write true or false for a given statement.
Sound can travel in a vacuum.
Describe an experiment to show that sound can travel in water.
Write the approximate speed of sound in steel.
What name is given to those aircrafts which fly at speeds greater than the speed of sound?
If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then λ for this wave in cm will be :
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her?
(The velocity of sound in air is 340 m/s.)
The speed of sound in a gaseous medium depends on ______.
The speed of sound in a gaseous medium depends on the nature of the gas.
Numerical problems:
Two persons are at opposite ends of a steel rod. One strikes the end of the rod with a stone. Find the ratio of time taken by the sound wave in the air and in steel to reach the second person. (Sound of speed in steel = 5960 ms-1, Sound of speed in air = 344 ms-1).
