A) 12 Hz
B) 15Hz
C) 17Hz
D) 11 Hz
Correct Answer: C
Solution :
As frequency \[=\frac{velocity}{wavelength}\] So, \[{{f}_{1}}=\frac{v}{{{\lambda }_{1}}}=\frac{340}{4}=85\,Hz\] and \[{{f}_{2}}=\frac{v}{{{\lambda }_{2}}}=\frac{340}{5}=68\,Hz\] The number of beats per second is the beat frequency and given by \[\Delta {{f}_{b}}={{f}_{1}}-{{f}_{2}}=85-68=17\,Hz\]You need to login to perform this action.
You will be redirected in
3 sec