1
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
Change Language
If n1, n2 and n3 are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by
A
$${1 \over n} = {1 \over {{n_1}}} + {1 \over {{n_2}}} + {1 \over {{n_3}}}$$
B
$${1 \over {\sqrt n }} = {1 \over {\sqrt {{n_1}} }} + {1 \over {\sqrt {{n_2}} }} + {1 \over {\sqrt {{n_3}} }}$$
C
$$\sqrt n = \sqrt {{n_1}} + \sqrt {{n_2}} + \sqrt {{n_3}} $$
D
n $$=$$ n1 + n2 + n3
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Change Language
The length of the wire between two ends of a sonometer is 100 cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1 : 3 : 5.
A
$${{1500} \over {23}}cm,{{500} \over {23}}cm$$
B
$${{1500} \over {23}}cm,$$ $${{300} \over {23}}cm$$
C
$${{300} \over {23}}cm,{{1500} \over {23}}cm$$
D
$${{1500} \over {23}}cm,{{2000} \over {23}}cm$$
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Two sources P and Q produce notes of frequency 660 Hz. each. A listener moves from P to Q with a speed of 1 ms$$-$$1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be
A
4
B
8
C
2
D
zero
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
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
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