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A polished metal plate has a rough and black spot. It is heated to 1400 K and brought immediately in a dark room. Which of the following is true? 
  • a)
    The spot will appear brighter than the plate
  • b)
    The spot will appear darker than the plate
  • c)
    The spot and plate will appear equally bright
  • d)
    The spot and the plate will not be visible in the dark room
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A polished metal plate has a rough and black spot. It is heated to 140...
  • Since 1400 K temperature is much higher temperature compared to the room temperature. So both the polished metal plate and the rough black spot will emit radiation at a higher rate.
  • Since the absorptive power of the rough black spot is more compared to the absorptive power of the polished metal plate, so according to Kirchoff's law, the emissive power of the black spot will also be more compared to the polished metal surface.
  • So the rough black spot will emit more radiation compared to the polished surface.
  • So the spot will appear brighter than the plate.
  • Hence, option 1 is correct.
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A polished metal plate has a rough and black spot. It is heated to 1400 K and brought immediately in a dark room. Which of the following is true?a)The spot will appear brighter than the plateb)The spot will appear darker than the platec)The spot and plate will appear equally brightd)The spot and the plate will not be visible in the dark roomCorrect answer is option 'A'. Can you explain this answer? for EmSAT Achieve 2025 is part of EmSAT Achieve preparation. The Question and answers have been prepared according to the EmSAT Achieve exam syllabus. Information about A polished metal plate has a rough and black spot. It is heated to 1400 K and brought immediately in a dark room. Which of the following is true?a)The spot will appear brighter than the plateb)The spot will appear darker than the platec)The spot and plate will appear equally brightd)The spot and the plate will not be visible in the dark roomCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for EmSAT Achieve 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A polished metal plate has a rough and black spot. It is heated to 1400 K and brought immediately in a dark room. Which of the following is true?a)The spot will appear brighter than the plateb)The spot will appear darker than the platec)The spot and plate will appear equally brightd)The spot and the plate will not be visible in the dark roomCorrect answer is option 'A'. Can you explain this answer?.
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