Advertisements
Advertisements
Question
A sound signal of 128 vibrations per second has a wavelength of 2.7 m. Calculate the speed with which the wave travels.
Advertisements
Solution
We have to find the velocity of the sound wave.
Frequency is number of vibrations produced per second.
Given: Frequency f = 128 Hz
Wavelength λ = 2.7 m
We know the relation between velocity, frequency, and wavelength ν = f × λ,
where ν is the velocity, f the frequency, and λ the wavelength.
So,
ν = (128) × (2.7) m/s
= 345.6 m/s
Therefore, velocity of sound is 346 m/s .
APPEARS IN
RELATED QUESTIONS
In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
Fill in the blank.
Sound travels faster in ________ than in liquids.
A boy fires a gun and another boy at a distance of 1020 m hears the sound of firing the gun 3 s after seeing its smoke. Find the speed of sound.
Which of the following is the speed of sound in copper and which in aluminium?
(a) 5100 m/s
(b) 1500 m/s
(c) 3750 m/s
If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a village
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.)
A source of sound is travelling with a velocity 40 km/h towards an observer and emits a sound of frequency 2000 Hz. If the velocity of sound is 1220 km/h, then the apparent frequency heard by the observer is _____.
Air temperature in the Rajasthan desert can reach 46°C. What is the velocity of sound in air at that temperature? (V0= 331 ms–1)
