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An observer is standing stationary in air moving at a speed of 2m/s. A source of frequency 20Hz is moving in the direction of wind with speed 10m/s towards the observer. What will be the frequency as heard by the observer? Speed of sound in air is 330m/s.
A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17m/s, the frequency registered is f2. If the speed of sound is 340m/s, then the ratio f1/f2 is?
There are 50 sportspersons in a summer sports camp. Every morning before the practice there is a compulsory warm up exercise in the ground. Sportspersons are doing their warm up in a single column and facing towards to the coach. The coach giving instruction to them from his fixed position. The distance between the coach and last sportsperson is 100 m. Once the coach whistled they dispose of their respective position. One day when the coach whistled at that time a heavy wind blowing towards the sportspersons with the velocity of 20 m/s, but nobody moved for 10 seconds. What frequency the last sportsperson heard when the whistle was blown? [The frequency of whistle is 16 kHz and velocity of sound is 340 m/s]
A source moves towards a stationary observer with a speed of 10m/s. If the frequency of the source is 10Hz what will be the wavelength of sound heard by the observer? Speed of sound = 330m/s.
A source of frequency 50Hz is moving towards an observer with a deceleration of 2m/s2. If its initial speed is 20m/s, what will be the maximum frequency heard by the observer? Initial distance between source and observer is 100m. Speed of sound = 330m/s.
The source of sound generating of a frequency of 3 kHz reaches an observer with a speed of 0.5 times the velocity of sound in air. The frequency heard by the observer is?
A man is moving towards a wall with a source of sound in his hand. Frequency of source = 50Hz. Speed of man = 8m/s. If the man sends one pulse of sound, what will be the frequency heard by him after sound reflects off the wall? Speed of sound = 330m/s.
A radar approaches an observer A whose speed Va = 17 m/s with frequency fa = 730 HZ at a distance of d = 141 m with a frequency shift 10 HZ. Find the frequency if the observer is at a speed vam = 340 m/s with a Doppler shift of 10 HZ with Laser light.
A vehicle, with a horn of frequency n is moving with a velocity of 30m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency n+n1. Then (if the sound velocity in air is 300m/s)
Velocity of source of sound, when to a stationary observer the frequency appears to be double the original frequency (velocity of sound = 330 ms–1) is -