engineering recuitment BEL Probationary Engineers Mock Test 2025 Heat Transfer Radiation

Sun’s surface at 6400 K emits radiation at a wavelength of 0.75 μ. A furnace at 327°C will emit through a small opening, radiation at a wavelength of nearly:

1

12 μ

2
8 μ
3
0.25 μ
4
0.025 μ
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