GENERAL KNOWLEDGE

Detailed explanation-1: -Description: Doppler Effect works on both light and sound objects. For instance, when a sound object moves towards you, the frequency of the sound waves increases, leading to a higher pitch. Conversely, if it moves away from you, the frequency of the sound waves decreases and the pitch comes down.

Detailed explanation-2: -A common example of Doppler shift is the change of pitch heard when a vehicle sounding a horn approaches and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession.

Detailed explanation-3: -The wavelength of the sound wave becomes longer as the car moves away. A longer wavelength means that not as many wave cycles can pass in a given time interval, so the frequency is lower, and thus the pitch of the sound is much lower.