Advertisements
Advertisements
प्रश्न
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 _____.
Advertisements
उत्तर
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 2068 Hz.
Hint:
Apparent frequency heard by the observer.
Data:
v = 1220 km/h (or) 339 ms-1
vS = 40 km/h (or) 11.1 ms-1
n = 2000 Hz
n' = `("v"/("v"-"v"_s))` n
= `(339/(339-11.1))` x 2000
= 1.03385 x 2000
= n' = 2068 Hz.
APPEARS IN
संबंधित प्रश्न
Write true or false for a given statement.
Sound can travel in a vacuum.
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.
Guess which sound has a higher pitch:
If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?
What is the time-period of a tuning fork whose frequency is 200 Hz?
When we put our ear to a railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
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 :
The speed of highly penetrating ultrasonic waves is :
When temperature increases the speed of sound ______.
The propagating disturbance that travels in a medium is called a ______.
