Processing math: 100%
Home / Aptitude Tests / Physics / The note produced by...

The note produced by a stretched string has a fundamental...

The note produced by a stretched string has a fundamental frequency of 400Hz. If the length of the string is doubled while the tension in the string is increased by a factor of 4, the frequency is

A.

200Hz

B.

400Hz

C.

800Hz

D.

1600Hz

Correct answer is B

F = 12L Tm

T2 = 4T1 ; L2 = 2L1

2F1L12F2L2 = T1T2

400×L1F×L1 = T14T1

F = 400Hz