NEET Chemistry: Photoelectric effect Practice Questions
12 free multiple-choice questions on Photoelectric effect (Atomic Structure) for NEET Chemistry, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. In the photoelectric effect, what physical quantity determines the maximum kinetic energy of the emitted photoelectrons?
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Correct answer: B — Work function of the metal
The maximum kinetic energy of the emitted photoelectrons depends solely on the energy of the incident photons, which is directly related to the frequency of the light and the work function of the material.
Q2. The minimum energy required to eject an electron from a metal surface is called the:
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Correct answer: C — Work function
The minimum energy required to liberate an electron from the surface of a metal is defined as the work function (φ).
Q3. What is the physical significance of the threshold frequency (ν₀) in the photoelectric effect?
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Correct answer: C — The frequency below which no photoemission occurs
The threshold frequency is the minimum frequency required for photoemission to occur; below this frequency, no photoemission happens.
Q4. In the photoelectric effect, the maximum kinetic energy of the emitted photoelectrons depends on:
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Correct answer: D — The frequency of the incident light
The maximum kinetic energy is determined by the energy of the incident photons minus the work function (KEₘₐₓ = hν- φ).
Q5. The photoelectric effect demonstrates that light energy is delivered in discrete packets. These packets are known as:
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Correct answer: C — Photons
The energy carried by light, which is absorbed by electrons in the photoelectric effect, is quantized and is described as discrete energy packets called photons.
Q6. According to Einstein's photoelectric equation, the energy of the incident photon is directly proportional to:
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Correct answer: B — The frequency of light
The energy of the incident photon (E=hν) is directly proportional to the frequency (ν) of the light.
Q7. In the photoelectric effect, the work function (φ) of a material is the minimum energy required to:
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Correct answer: D — cause the emission of photoelectrons
The work function (φ) is the minimum energy required to remove an electron from the material's surface. This minimum energy is necessary to initiate the emission of photoelectrons, which is the core concept of the photoelectric effect.
Q8. The emission of photoelectrons is explained by the quantum theory of light, which states that light consists of discrete packets of energy. These energy packets are called:
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Correct answer: D — Photons
The photoelectric effect is fundamentally based on the particle nature of light, where energy is transferred in discrete units called photons.
Q9. The minimum energy required to cause photoemission from a metal surface is known as the:
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Correct answer: D — Work Function
The minimum energy required to eject an electron is the work function (φ), which is the minimum energy threshold required for the photoelectric effect to occur.
Q10. The energy gained by the emitted electron is determined by the difference between the energy of the incident photon and the energy required to overcome the material's binding force. This energy difference is related to the:
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Correct answer: A — Work function
The kinetic energy of the emitted electrons (Kₘₐₓ) is the difference between the incident energy (related to photon energy) and the work function of the material.
Q11. The minimum energy required to cause the emission of photoelectrons from a metallic surface is known as:
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Correct answer: A — Work function
The minimum energy required to liberate an electron from the material is defined as the work function (φ).
Q12. In the context of the photoelectric effect, the energy of the emitted photoelectrons is directly proportional to the frequency of the incident radiation. This relationship is described by which fundamental equation?
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Correct answer: D — E = hv
The maximum kinetic energy of the emitted electrons is equal to the energy of the incident photon minus the work function. The energy of a single photon is directly proportional to its frequency, as given by Planck's equation, E = hν.
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