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Robert · Accepted Answer

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Explanation: 
Revision Pack 14 
1.   These waves are added like vectors. 
 
2. Beat frequency is given as the difference of two frequencies. As in this case one frequency is 
440 Hz and beat frequency is 3. Therefore the possible solution is 437 Hz or 443 hz. Since it is 
given that when we tighten the string beat frequency decreases. So 437 hz is the correct 
answer ( Tighter string has higher frequency so if you will take 443 Hz, then after tightening 
the string beat frequency will increase. 
3.      (   
  
 
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       (   
  
 
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Q.No Revision pack 14 answer Revision pack 15 answer Revision pack 
16 answer 
1 4. 50m 1. true 1. 180 
2 2. 437 Hz 1. true 4. is black 
3 1. true 1. rapidly varying harmonic function 3 
4 3. depends on phase difference 2. odd function 3 
5 3. a wave maximum of which 
depends on the phase shift of the 
two waves 
2. sine 4 
6 3. almost equal to w1 1. True 2. False 
7 1. difference between two 
frequency 
1.    0 3. wavelength 
8 1. an amplitude modulated wave 2. false 1. True 
9 2. False 3. discontinuities 1. 6.44 x 10^-7 
10 2.   6.6 sec  &20 sec 1. odd function 2. False
 
 

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     (   
 
 
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Hence, the answer.
4. Sum of two sine waves as can be seen from the above is dependent on the phase difference 
between them. 
5.                      
       (
 
 

 
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Hence we can see that the amplitude is dependent on the phase shift.
6. Beat frequency is possible only if two frequencies are very close to each other but not equal. 
7. Definition of beat frequency as given in answer of question 2. 
8.
As we can see the amplitude of the signal at different time is not constant, hence frequency 
modulation is ruled out.

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