1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Two sources of sound placed close to each other, are emitting progressive waves given by
y1 = 4sin600$$\pi $$t and y2 = 5sin608$$\pi $$t
An observer located near these two sources of sound will hear
A
4 beats per second with intensity ratio 25 : 16 between waxing and waning.
B
8 beats per second with intensity ratio 25 : 16 between waxing and waning.
C
8 beats per second with intensity ratio 81 : 1 between waxing and warning.
D
4 beats per second with intensity ratio 81 : 1 between waxing and waning.
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together would be
A
0.01
B
0.02
C
0.03
D
0.04
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Two waves are represented by the equations
y1 = $$a$$sin($$\omega $$t + kx + 0.57) m and
y2 = acos($$\omega $$t + kx) m, where x is in meter and t $$in$$ sec. The phase difference between them is
A
1.0 radian
B
1.25 radian
C
1.57 radian
D
0.57 radian
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air
A
decrease by a factor 10
B
increase by a factor 20
C
increase by a factor 10
D
decrease by a factor 20
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