मराठी

Heat energy is incident on the surface at the rate of 1000 J/min. If the coefficient of absorption is 0.8 and the coefficient of reflection is 0.1 then heat energy transmitted by the surface -

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प्रश्न

Heat energy is incident on the surface at the rate of 1000 J/min. If the coefficient of absorption is 0.8 and the coefficient of reflection is 0.1 then heat energy transmitted by the surface in 5 minutes is ______.

पर्याय

  • 100J

  • 500J

  • 700J

  • 900J

MCQ
रिकाम्या जागा भरा

उत्तर

Heat energy is incident on the surface at the rate of 1000 J/min. If the absorption coefficient is 0.8 and the reflection coefficient is 0.1 then the heat energy transmitted by the surface in of 5 minutes is 500J.

Explanation:

r + a + t = l

∴ t = 1 − r − a

= 1 − 0.8 − 0.1

= 1 − 0.9

= 0.1

Q = 1000 J/min

∴ Heat energy transmitted per minute

Qt = Q × t

= 1000 × 0 .1

= 100J

∴ Heat energy transmitted in 5 minutes

= 100 × 5

= 500J

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