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

Explore 161 free Dual Nature of Radiation and Matter questions in NEET 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 31–60 of 161.

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 →Match the photoelectric termRead the answer and worked solution →True or false about photoemissionRead the answer and worked solution →Set by intensity or by frequency?Read the answer and worked solution →Order the photoelectric storyRead the answer and worked solution →Complete the photoelectric ruleRead the answer and worked solution →Name the physicistRead the answer and worked solution →Dual nature numbersRead the answer and worked solution →Dual nature bingoRead the answer and worked solution →Photoelectric emission was discovered in the year:Read the answer and worked solution →Who discovered photoelectric emission?Read the answer and worked solution →Hallwachs and Lenard investigated photoelectric emission during:Read the answer and worked solution →Lenard observed photoemission when he used radiation that was:Read the answer and worked solution →The minimum frequency below which no photoemission occurs is the:Read the answer and worked solution →

Worked practice questions

Below the threshold frequency, photoelectric emission:

  1. Is very intense
  2. Is delayed once
  3. Doubles slowly
  4. Does not occur
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Correct answer: D. Does not occur

1. Each photon must carry at least the work function. 2. A photon below the threshold cannot supply it. 3. So no emission occurs at all. 4. The answer is does not occur. _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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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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