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CUET UG Dual Nature of Radiation and Matter — practice questions — page 2

Explore 40 free Dual Nature of Radiation and Matter questions in CUET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Dual Nature of Radiation and Matter questions and exercises with answers

Showing questions 31–40 of 40.

The negative voltage that just stops the current is called the:Read the answer and worked solution →Photoelectric emission begins after a time lag that is:Read the answer and worked solution →The maximum photoelectric current at high positive voltage is the:Read the answer and worked solution →The waves associated with moving particles are called:Read the answer and worked solution →Ultraviolet light causing emission was studied in detail by:Read the answer and worked solution →The de Broglie wavelength of a fast electron is comparable with:Read the answer and worked solution →The de Broglie relation contains a wave concept together with a:Read the answer and worked solution →Photoelectric current falls to zero at which voltage?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 →However intense the light, no emission occurs below the:Read the answer and worked solution →

Worked practice questions

The negative voltage that just stops the current is called the:

  1. Steady potentials
  2. Stopping potential
  3. Starting potential
  4. Standard potential
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Correct answer: B. Stopping potential

1. A retarding voltage turns the fastest electrons back. 2. At one particular value the current reaches zero. 3. That value is the stopping potential. 4. So the answer is stopping potential. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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Photoelectric emission begins after a time lag that is:

  1. Around one day
  2. Close to a week
  3. Effectively none
  4. About one hour
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Correct answer: C. Effectively none

1. Wave theory predicted a long wait for weak light. 2. Experiment found emission starting at once. 3. The process is instantaneous. 4. So the answer is effectively none. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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The maximum photoelectric current at high positive voltage is the:

  1. Saturation current
  2. Alternating current
  3. Displacement current
  4. Photoelectric wave
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Correct answer: A. Saturation current

1. Raising the collector voltage gathers more electrons. 2. Eventually every emitted electron is collected. 3. The current then levels off at the saturation current. 4. So the answer is saturation current. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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