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Physics -- Sound
16.
An organ pipe filled with a gas at 27oC resonates at 400 Hz in its
fundamental mode. If it is filled with the same gas at 90oC, the
resonance frequency will be
- A.420 Hz
- B.440 Hz
- C.484 Hz
- D.512 Hz
- Answer
- Report
Answer : [B]
17.
point source emits sound equally in all directions in a
nonabsorbing medium. Two points P and Q are at distances of
9 m and 25 m respectively from the source. The ratio of the
amplitudes of the waves at P and Q is
- A.5 : 3
- B.3 : 5
- C.25 : 9
- D.625 : 81
- Answer
- Report
Answer : [C]
18.
A source of sound is in the shape of a long narrow cylinder
radiating sound waves normal to the axis of the cylinder. Two
points P and Q are at perpendicular distances of 9 m and 25 m
from the axis. The ratio of the amplitudes of the waves at P and
Q is
- A.5 : 3
- B.√5 : √3
- C.3 : 5
- D.25 : 9
- Answer
- Report
Answer : [A]
19.
Two identical sounds A and B reach a point in the same phase.
The resultant sound is C. The loudness of C is n dB higher than
the loudness of A. The value of n is
- A.2
- B.3
- C.4
- D.6
- Answer
- Report
Answer : [D]
20.
Sound of wavelength λ passes through a Quincke’s tube, which is adjusted to give a maximum intensity I0. Through what distance should the sliding tube be moved to give an intensity I0/ 2?
- A.λ/2
- B.λ/3
- C.λ/4
- D.λ/8
- Answer
- Report
Answer : [D]
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