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Agniveer Air Force Dual Nature of Radiation and Matter — practice questions

Explore 20 free Dual Nature of Radiation and Matter questions in Agniveer Air Force 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

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The minimum energy needed to free an electron from a metal is its:Read the answer and worked solution →Work function is usually measured in:Read the answer and worked solution →Photoelectric emission was discovered in 1887 by:Read the answer and worked solution →Below the threshold frequency, photoelectric emission:Read the answer and worked solution →The maximum photoelectric current at high positive voltage is the:Read 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 →Who explained the photoelectric effect in 1905?Read the answer and worked solution →In Einstein's picture, radiation travels as:Read the answer and worked solution →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 →Who proposed that matter also has a wave nature?Read the answer and worked solution →The waves associated with moving particles are called:Read the answer and worked solution →The de Broglie relation contains a wave concept together with a:Read the answer and worked solution →Ultraviolet light causing emission was studied in detail by:Read the answer and worked solution →However intense the light, no emission occurs below the:Read the answer and worked solution →Photoelectric current falls to zero at which voltage?Read the answer and worked solution →The de Broglie wavelength of a fast electron is comparable with:Read the answer and worked solution →

Worked practice questions

The minimum energy needed to free an electron from a metal is its:

  1. Work function
  2. Kinetic energy
  3. Stopping value
  4. Threshold power
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Correct answer: A. Work function

1. Electrons are bound inside the metal surface. 2. Some energy must be supplied before one can escape. 3. That minimum is the work function. 4. So the answer is work function. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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Work function is usually measured in:

  1. Degrees kelvin
  2. Electron volts
  3. Metres per hour
  4. Kilograms force
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Correct answer: B. Electron volts

1. The energies involved are far too small for joules to be handy. 2. A unit built from the electron's charge suits better. 3. Work function is quoted in electron volts. 4. So the answer is electron volts. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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Photoelectric emission was discovered in 1887 by:

  1. Ohms
  2. Bose
  3. Hertz
  4. Bohr
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Correct answer: C. Hertz

1. It was noticed during experiments on electromagnetic waves. 2. The experimenter was working with a spark discharge. 3. That was Heinrich Hertz. 4. So the answer is Hertz. _Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_

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