GK
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A man sitting on the sidewalk and a honking car parked near the stoplight.
|
|
|
An ambulance with its siren on moves toward a by-stander.
|
|
|
A girl moves toward a speaker.
|
|
|
A meowing cat and a silent mouse moves toward each other.
|
Detailed explanation-1: -Doppler’s effect will not be applicable when the velocity of sound source is greater than the velocity of sound.
Detailed explanation-2: -There will be no Doppler effect and the apparent frequency as heard by the listener will be the same as the source frequency, when: When both the source and the listener are at rest. When they move in such a way that distance between them remains constant, i.e. their velocity is the same.
Detailed explanation-3: -Notice that a Doppler shift only occurs when objects are heading towards or away from each other. This is called line-of-sight motion. “Sideways” motion, called transverse motion does not cause a Doppler shift, as you can see in Text Figure 3.16.
Detailed explanation-4: -The drop in pitch of ambulance sirens as they pass by and the shift in red light are common examples of the Doppler Effect.