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A railroad locomotive is at rest with its whistle shrieking, and then it starts moving toward you.
a) Does the frequency of the sound that you hear increase, decrease, or stay the same?
b) How about the wavelength reaching your ear?
c) How about the speed of the sound in the air between you and the locomotive?

Respuesta :

Answer:

Explanation:When a railroad locomotive starts moving towards a stationary observer with velocity [tex]v_s[/tex] then apparent frequency of locomotive can be given by

[tex]f'=f\frac{v}{v-v_s}[/tex]

From above formula we can say that

apparent frequency f' is greater than actual frequency f            

(b)As Frequency is increasing therefore wavelength is decreasing

as [tex]frequency\propto \frac{1}{wavelength}[/tex]      

(c)Speed of sound in the air has no effect so it remains same

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