Eleven tuning forks are arranged in increasing order of frequency in such a way that any two consecutive tuning forks produce 4 beats per second. The highest frequency is twice that of the lowest. The highest and the lowest frequencies (in Hz) are, respectively:

1. 100 and 50 2. 44 and 22
3. 80 and 40 4. 72 and 30
Subtopic:  Beats |
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A source of unknown frequency gives 4 beats/s when sounded with a source of known frequency 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

(1) 254 Hz

(2) 246 Hz

(3) 240 Hz

(4) 260 Hz

Subtopic:  Beats |
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From NCERT
NEET - 2013
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Two sources of sound placed close to each other, are emitting progressive waves given by

y1=4 sin 600πt and y2=5 sin 608 πt

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 waning

(d) 4 beats per second with intensity ratio 81:1 waxing and waning

Subtopic:  Beats |
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From NCERT
NEET - 2012
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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 the occurrence of 6 beats/s when both the wires oscillate together would be:

1. 0.02 2. 0.03
3. 0.04  4. 0.01
Subtopic:  Beats |
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From NCERT
NEET - 2011
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A tuning fork of frequency 512 Hz makes 4 beats/s with the vibrating strings of a piano. The beat frequency decreases to 2 beats/s when the tension in the piano strings is slightly increased. The frequency of the piano string before increasing the tension was:
1. 510 Hz                       
2. 514 Hz
3. 516 Hz                       
4. 508 Hz

Subtopic:  Beats |
 70%
From NCERT
NEET - 2010
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Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20N force. Mass per unit length of both the strings is same and equal to 1 gm-1When both the strings vibrate simultaneously the number of beats is :

1. 5                                                   

2. 7

3. 8                                                   

4. 3

Subtopic:  Beats |
 59%
From NCERT
NEET - 2009
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Two waves of frequencies 20 Hz and 30 Hz travel out from a common point. The phase difference between them after 0.6 sec is :

(1) Zero

(2) π2

(3) π

(4) 3π4

Subtopic:  Beats |
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From NCERT
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Two tuning forks when sounded together produced 4 beats/sec. The frequency of one fork is 256 Hz. The number of beats heard increases when the fork of frequency 256 Hz is loaded with wax. The frequency of the other fork is(in Hz) :

(1) 504

(2) 520

(3) 260

(4) 252

Subtopic:  Beats |
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A tuning fork sounded together with a tuning fork of frequency 256 Hz emits two beats. On loading the tuning fork of frequency 256 Hz with wax, the number of beats heard are 1 per second. The frequency of the other tuning fork is :

(1) 257

(2) 258

(3) 256

(4) 254

Subtopic:  Beats |
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If two tuning forks A and B are sounded together, they produce 4 beats per second. A is then slightly loaded with wax, they produce 2 beats when sounded again. The frequency of A is 256. The frequency of B will be :

(1) 250

(2) 252

(3) 260

(4) 262

Subtopic:  Beats |
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