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M.Tech (PSU recruitment) Postgraduate Physics — practice questions

Explore 29 free Postgraduate Physics questions in M.Tech (PSU recruitment) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Postgraduate Physics questions and exercises with answers

Showing questions 1–29 of 29.

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 →The law about total power radiated across all wavelengths is:Read the answer and worked solution →Treating a star as a blackbody, its radiated power goes as temperature raised to the:Read the answer and worked solution →The classical model of cavity radiation gives a result known as the:Read the answer and worked solution →That classical failure at short wavelengths is called the ultraviolet:Read the answer and worked solution →The blackbody problem was finally solved in 1900 by:Read the answer and worked solution →Planck called his discrete packets of energy:Read the answer and worked solution →The whole number labelling each allowed energy is called a quantum:Read the answer and worked solution →Light knocking electrons out of a metal surface is called the:Read the answer and worked solution →Below a certain frequency no electrons come out at all. That threshold is the:Read the answer and worked solution →In the photoelectric effect, each photon hands its energy to how many electrons?Read the answer and worked solution →The minimum energy needed to free an electron from a metal is its:Read the answer and worked solution →Even with very dim light the photoelectric effect still happens, because the interaction is:Read the answer and worked solution →Einstein's model says the maximum kinetic energy of photoelectrons varies with frequency as a:Read the answer and worked solution →X rays scattered from a material come back with a longer wavelength. That is the:Read the answer and worked solution →Compton gave his explanation of that scattering in:Read the answer and worked solution →The Compton effect mattered because it showed radiation is not purely a:Read the answer and worked solution →In 1924 the idea that matter can behave like waves was proposed by:Read the answer and worked solution →Catch the quantum termsRead the answer and worked solution →Pop the blackbody lawsRead the answer and worked solution →Run the quantum gatesRead the answer and worked solution →Slice the quantum wordsRead the answer and worked solution →Classical or quantumRead the answer and worked solution →Sort the quantum ideasRead the answer and worked solution →Type the numberRead the answer and worked solution →Quantum bingoRead 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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More Physics topics

Photons and Matter WavesPhysics