Three sound waves of equal amplitudes have frequencies (n - 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be

  • Option 1)

    1

  • Option 2)

    4

  • Option 3)

    3

  • Option 4)

    2

 

Answers (1)
V Vakul

 

Beat Frequency -

Delta 
u = left | 
u _{1}-
u _{2} 
ight |

module of left ( 
u _{1} -
u _{2}
ight )

 

- wherein

Where 
u _{1} : and: 
u _{2} are frequency of two wave differ slightly  in value of frequency.

 

 Beats produced is max difference two wave frequency

(1) and (2)  x-(x-1) =1

(2) and (3)  (x+1) -x = 1

(1) and (3)  (x+1) (x-1) = 2

 


Option 1)

1

Incorrect option

Option 2)

4

Incorrect option

Option 3)

3

Incorrect option

Option 4)

2

Correct option

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