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An echo is heard when minimum distance o...

An echo is heard when minimum distance of the reflecting surface is –

A

10 cm

B

17 m

C

34 m

D

340 m

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The correct Answer is:
B
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A point sources S emitting light of wavelength 600nm is placed at a very small height h above the flat reflecting surface AB (see figure).The intensity of the reflected light is 36% of the intensity.interference firnges are observed on a screen placed parallel to the reflecting surface a very large distance D from it. (A)What is the shape of the interference fringes on the screen? (B)Calculate the ratio of the minimum to the maximum to the maximum intensities in the interference fringes fromed near the point P (shown in the figure) (c) if the intenstities at point P corresponds to a maximum,calculate the minimum distance through which the reflecting surface AB should be shifted so that the intensity at P again becomes maximum.

An echo will be heard if the minimum distance between the source of sound and the obstacle is

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