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A fixed source of sound emitting a certain frequency appears as f_(a) when the observer is apporoaching the source with upsilon_(0) and f_(r) when the observer recedes from the source with the same speed. The frequency of source is

A source of sound and a listener both are moving in the same direction,the source following the listener. If the respective velocities of sound ,source and listener are v, v_s and v_'//s then the ratio of the actual frequency of the source and the apparent frequency as received by the listener is

The two coherent sources of monochromatic light of wavelength lambda are located at a separation lambda . The two sources are placed on a horizontal line and screen is placed perpendicular to the line joining the sources. Find position of the farthest minima from the centre of the sources.

The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. Then the speed of the source will be

Interference pattern is obtained with a source of red light of wavelength 6400 Å. The source is then replaced by another source of wavelength 4000 Å. It is found that nth bright fringe of first source coincides with ( n + 3 ) ^( th ) bright finge of second source. The order of finge is equal to