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Emissive and Absorptive Power

37.a source o...

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37.a source of power 600 kilowatt emits Photon which incident on a surface 2.5 M away out of which 50% is reflect back, what is radiation pressure on surface

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Q. A source of power

600 k W

emits photon which incident on a surface

2.5 m

away out of which

50 %

is reflected back. What is the radiation pressure on the surface :

Q. Which of the following formula is correct for radiation pressure if light is obliquely incident on a partially reflecting surface?

Q. If radiation are incident obliquely on a perfectly reflecting surface then the pressure exerted by radiation on the surface will be:

Q. A radiation of

200 W

is incident on a surface which is

60

% reflecting and

40

% absorbing. Find the net Force acting on the surface.

Q. (a) Monochromatic light of frequency

6.0 \times 10^{14} H z

is produced by a laser. The power emitted is

2.0 \times 10^{- 3} W

. Estimate the number of photons emitted per second on an average by the source.
(b) Draw a plot showing the variation of photoelectric current versus the intensity of incident radiation on a given photosensitive surface.

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