Oscillations and Waves-Doppler Effect in Sound [HBCSE Olympiads (Homi Bhabha Centre for Science Education) NSEP (Physics)]: Questions 1 - 2 of 2
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Question 1
Appeared in Year: 2016
Question
MCQ▾Two factories are sounding their sirens at each. A man walks from one factory towards the other at a speed of . the speed of sound is . The number of beats heard per second by the man is
Choices
Choice (4) | Response | |
---|---|---|
a. | 7.5 | |
b. | 6 | |
c. | 2.5 | |
d. | 5 |
Question 2
Appeared in Year: 2016
Question
MCQ▾Two identical loudspeakers, placed close to each other inside a room, are supplied with the same sinusoidal voltage. One can imagine a pattern around the loudspeakers with areas of increased and decreased sound intensity alternately located. Which of the following actions will NOT change the locations of these areas?
Choices
Choice (4) | Response | |
---|---|---|
a. | Replacing the air in the room with a different gas | |
b. | Changing the frequency of the signal voltage | |
c. | Moving one of the speakers | |
d. | Changing the amplitude of the signal voltage |