KVS DEC-2013

Question 1

When the object making the sound is moving towards you, the frequency goes up due to he waves getting pushed more tightly together. The opposite happens when the object moves away from you and the pich goes down. This phenomenon is called

A	Band Width
B	Doppler effect
C	Sound refraction
D	Vibrations

Data-CommunicationDoppler-Effect

Question 1 Explanation:

→ The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.
→ The Doppler effect is observed whenever the source of waves is moving with respect to an observer.
→ The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is
approaching and an apparent downward shift in frequency for observers from whom the source is receding.

Correct Answer: B

Question 1 Explanation:

→ The Doppler effect is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.
→ The Doppler effect is observed whenever the source of waves is moving with respect to an observer.
→ The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is
approaching and an apparent downward shift in frequency for observers from whom the source is receding.