(a) Explain the phenomesnon of beats ?
(b) Compare and contreast it with interference.

Explain how the phenomenon of beats may be used for finding the unknown frequency of a tuning fork.

Find the maxinum intensity in case of interference of n identical waves each of intensity I_(0) if the interference is (a) coherent and (b) incoherent.

(a) Explain why BF_(3) exists whereas BH_(3) does not. (b) Compare the B-F bond length in BF_(3) and BF_(4)^(-)

Explain some practical applications of beats.

Two tuning forks A and B produce 4 beats // sec. On loading B with wax, 6 beats // sec are heard. If quantity of wax is reduced, the number of beats per second again becomes 4.Find the frequency of B if the frequency of A is 256 Hz.

Explain briefly the analytical method of formation of beats.

The number of correct statements are 1) Maximum intensity of sound(waxing) is produced in the beats when constructive interference takes place II) Minimum intensity of sound(waning) is produced in the beats when destructive interference takes place III) Beats phenomenon used to detect the presence of dangerous gases in mines IV) Beats phenomenon used to detect unknown frequency of a tuning fork with the help of a standard tuning fork

A tuning fork A of frequency 256 Hz when sounded with tuning fork B of unknown frequency produces 4 beats/s. When B is loaded with wax, 6 beats/s were heard. If some of the wax is reduced, the number of beats again reduces to 4 beats/s. Determine the initial frequency of B.