A fork gives 5 beats with a 40cm length of sonometer wire. If the length of the wire is shortened by 1cm, the number of beats is still the same. The f

Question

A fork gives 5 beats with a 40cm length of sonometer wire. If the length of the wire is shortened by 1cm, the number of beats is still the same. The f

A fork gives 5 beats with a 40cm length of sonometer wire. If the length of the wire is shortened by 1cm, the number of beats is still the same. The frequency of the fork is
A. 385 Hz
B. 320Hz
C. 395Hz
D. 400 Hz

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
`n_2 gt n gt n_1`
`n_2 - n=5`
`(n-n_1=5)/(n_2-n_1=10)`
`n_2/n_1 = l_1/l_2 = 40/39`
`(n_2-n_1)/(n_1) = (40-39)/(39) = 1/39`
`10/n_1 = 1/39 " " therefore n_1= 390`
`therefore n=n_1+5`
=390+5=395

4 views Answered 2023-02-05 15:29