1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A source of unknown frequency gives 4 beats/s when sounded with a source of known frquency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is
A
240 Hz
B
260 Hz
C
254 Hz
D
246 Hz
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A train moving at a speed of 220 m s$$-$$1 towards a stationary object, emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is
(Speed of sound in air is 330 m s$$-$$1)
A
3500 Hz
B
4000 Hz
C
5000 Hz
D
3000 Hz
3
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
The equation of a simple harmonic wave is given by

y = 3 sin$${\pi \over 2}$$(50t $$-$$ x),

where x and y are in metres and t is in seconds. The ratio of maximum particle velocity to the wave velocity is
A
2$$\pi $$
B
$${3 \over 2}\pi $$
C
$$3\pi $$
D
$${2 \over 3}\pi $$
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
When a string is divided into three segments of length $$l$$1, $$l$$2 and $$l$$3 the fundamental frequencies of these three segments are $${\upsilon _1},{\upsilon _2}$$ and $${\upsilon _3}$$ respectively. The original fundamental frequency ($$v$$) of the string is
A
$$\sqrt v = \sqrt {{v_1}} + \sqrt {{v_2}} + \sqrt {{v_3}} $$
B
$$v = {v_1} + {v_2} + {v_3}$$
C
$${1 \over v} = {1 \over {{v_1}}} + {1 \over {{v_2}}} + {1 \over {{v_3}}}$$
D
$${1 \over {\sqrt v }} = {1 \over {\sqrt {{v_1}} }} + {1 \over {\sqrt {{v_2}} }} + {1 \over {\sqrt {{v_3}} }}$$
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