Exercise ::
Radiation : Processes And Properties
Answer: Option D
Explanation:
This is a very small quantity. The response of the body to incident radiations is, however, completely independent of and unaffected by the simultaneous emission from the body.
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2. A cavity with a small hole will always behave as a? A. Opaque body B. Black body C. Transparent body D. White body
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Answer: Option B
Explanation:
No radiation passing in and out will have any effect upon the equilibrium of radiation inside the cavity.
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3. What is the wavelength band of gamma rays? A. 4 * 10 -7 to 1.4 * 10 -4 micron meter B. 3 * 10 -7 to 3.4 * 10 -4 micron meter C. 2 * 10 -7 to 2.4 * 10 -4 micron meter D. 1 * 10 -7 to 4 * 10 -4 micron meter
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Answer: Option A
Explanation:
This is the maximum and minimum wavelength for gamma rays.
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4. Transmissivity is defined as? A. Fraction of total energy transmitted by the body B. Fraction of total energy reflected by the body C. Fraction of total energy absorbed by the body D. Fraction of total energy absorbed and radiated by the body
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Answer: Option A
Explanation:
It is a fraction of total energy transmitted by the body.
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5. Radiant energy with an intensity of 800 W/m 2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission? A. 125.47 W/m 2 B. 135.47 W/m 2 C. 145.47 W/m 2 D. 155.47 W/m 2
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Answer: Option C
Explanation:
Rate of transmission = T Q 0 = 145.47 W/m2 .
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