At the poles, a stretched wire of a certain length vibrates in unison with a tuning fork of given frequency. Then at the equator, for the same setting, for producing resonance with the same tuning fork, the vibrating length of the wire

Options

A. should be increased
B. should be decreased
C. should not be changed
D. should be doubled

Answer

B

Explanation

`n = 1/(2L) sqrt(T/m) = 1/(2L) sqrt((Mg)/m) `
At the equator , g is decreased. For resonance, n should be kept constant. For this L should be decreased.