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IIT JAM (M.Sc) — free MCQ practice

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IIT JAM (M.Sc) subjects

Physics (29)

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Photons and Matter WavesPhysicsPostgraduate Physics

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An object that absorbs every bit of radiation falling on it is called a:Read the answer and worked solution →In the lab, a blackbody is built as a small hole in the wall of a:Read the answer and worked solution →The intensity of blackbody radiation depends on wavelength and on:Read the answer and worked solution →One law gives the wavelength at which a blackbody radiates most strongly. It is:Read the answer and worked solution →

Worked practice questions

An object that absorbs every bit of radiation falling on it is called a:

  1. Blackbody
  2. Blackboard
  3. Blacksmith
  4. Blackthorn
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Correct answer: A. Blackbody

1. Nothing is reflected or transmitted. 2. It is a perfect absorber. 3. That object is a blackbody. _Source: OpenStax University Physics Volume 3, Chapter 6, Photons and Matter Waves._

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In the lab, a blackbody is built as a small hole in the wall of a:

  1. Canvas
  2. Cavity
  3. Cabin
  4. Casket
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Correct answer: B. Cavity

1. Light entering the hole cannot escape. 2. It bounces inside until absorbed. 3. So the hole in a cavity acts as one. _Source: OpenStax University Physics Volume 3, Chapter 6, Photons and Matter Waves._

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The intensity of blackbody radiation depends on wavelength and on:

  1. Temperature
  2. Tempering
  3. Templates
  4. Terminals
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Correct answer: A. Temperature

1. Hotter bodies glow differently. 2. The curve shifts with heat. 3. So temperature matters. _Source: OpenStax University Physics Volume 3, Chapter 6, Photons and Matter Waves._

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