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A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature of 727⁰C, the rate of heat radiated in the same units will be:
Options
(a) 50
(b) 112
(c) 80
(d) 60
Correct Answer:
112
Explanation:
According to Stefan’s law, E ∞ σT⁴, T₁ = 500 K T₂ = 1000 K
E₂ / E₁ = (T₂ / T₁)⁴ = (1000 / 500)⁴ = 16
E₂ = 16 x 7 = 112 cal/ cm²s
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Topics: Properties of Bulk Matter
(130)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The angle of incidence at which reflected light is totally polarised for refraction
- An electric dipole of length 1 cm is placed with the axis making an angle of 30⁰
- Electrons in a certain energy level n=n₁, can emit 3 spectral lines. When they
- Given the value of Rydberg constant is 10⁷ m⁻¹, the wave number of the last line
- If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be
Topics: Properties of Bulk Matter (130)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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