Assume that a police siren emits sound of wavelength `2cm`. If an observer moving with a speed `20m`/`s`, approaches a stationary police jeep which with its siren switched on, then the wavelength observed by the observer will be

An observer is approaching with a speed v , towards a stationary source emitting sound waves of wavelength lambda_0 . The wavelength shift detected by the observer is ( Take c= speed of sound )

A source of sound producing wavelength 50 cm is moving away from a stationary observer with (1/5)^(th) speed of sound. Then what is the wavelength of sound received by the observer?

Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the wavelength of reflected waves will be

a sound source emits frequency of 180 h_(Z) when moving towards a rigid wall with speed 5 m//s and an observer is moving away from with speed 5 m//s . Both source and observer moves on a straight line which is perpendicular to the wall. The number of beatd per second heard by the observer will be [speed of sound = 335 m//s ]

A star emits light of 5500 Å wavelength. Its appears blue to an observer on the earth, it means

An observer approaches towards a stationary source of sound at constant velocity and recedes away at the same speed. The graph of wavelength observed with time is:

Earth is moving towards a stationary star with a velocity 100 kms^(-1) . If the wavelength of light emitted by the star is 5000Å, then the apparent change in wavelength observed by the observer on earth will be

A source of sound produces waves of wavelength 60 cm when it is stationary if the speed of sound in air is 320(m)/(s) and source moves with speed 20(m)/(s) , the wavelength of sound in the forward direction will be nearest to

A source and an observer are situated on two perpendicular tracks as shown in the figure the observer is at rest and source is moving with a speed 50m//s the source emits sound waves of frequency 90Hz which travel in the medium with velocity 200m//s the frequency of sound heard by observer when the source crosses the origin is

To an observer, the pitch of a stationary source of sound appears to be reduced by 20%. If the speed of sound is 340m/s then speed and direction of the observer is