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ISC Class 12 Dual Nature of Radiation and Matter — practice questions — page 2

Explore 50 free Dual Nature of Radiation and Matter questions in ISC Class 12 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 31–50 of 50.

The number of photoelectrons emitted per second depends on the:Read the answer and worked solution →The kinetic energy of the photoelectrons is set by the:Read the answer and worked solution →Increasing the intensity of light leaves the stopping potential:Read the answer and worked solution →The work function of a surface depends on the:Read the answer and worked solution →Dual nature numbersRead the answer and worked solution →Match the photoelectric termRead the answer and worked solution →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 →Set by intensity or by frequency?Read the answer and worked solution →The momentum carried by a photon of wavelength $\lambda$ isRead 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 →Order the photoelectric storyRead 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 →Charging a pith ball by conductionRead the answer and worked solution →

Worked practice questions

The number of photoelectrons emitted per second depends on the:

  1. Length of the wire
  2. Number of photons
  3. Energy per photon
  4. Metal's own colour
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Correct answer: B. Number of photons

1. Each absorbed photon can free at most one electron. 2. More photons arriving means more electrons leaving. 3. So the count depends on the number of photons per second. 4. The answer is number of photons. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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The kinetic energy of the photoelectrons is set by the:

  1. Size of the plate
  2. Age of the sample
  3. Energy per photon
  4. Number of photons
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Correct answer: C. Energy per photon

1. Intensity changes how many electrons come out, not how fast. 2. Speed is fixed by what each single photon delivers. 3. So the kinetic energy follows the energy of each photon. 4. The answer is energy per photon. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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Increasing the intensity of light leaves the stopping potential:

  1. Doubled up
  2. Halved off
  3. Wiped out
  4. Unchanged
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Correct answer: D. Unchanged

1. Intensity raises the saturation current. 2. It does not change the energy each photon carries. 3. So the stopping potential stays unchanged. 4. The answer is unchanged. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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