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Photoelectric Effect MCQs for Competitive Exams

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Photoelectric Effect MCQs for Competitive Exams

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Topic Notes: Photoelectric Effect

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Photoelectric Effect MCQs in Physics are useful for candidates who need targeted practice for CSS, PMS, FPSC, PPSC, NTS, entry tests, and other competitive exams in Pakistan. This topic page is designed for quick revision, repeated practice, and exam-focused preparation.

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11
In the photoelectric effect, the threshold wavelength is 2756 Å. If light of wavelength 1700 Å is incident on a metal substance, determine the kinetic energy of the photoelectrons:
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12
In the photoelectric effect, electromagnetic radiation is incident upon the surface of a metal. Which of the following is not a true statement about the photoelectric effect?
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13
In demonstrating photoelectric effect, when light falling on the cathode is cut off, the ammeter shows:
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14
In photoelectric effect removal of photons is observed at ____ energies.
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15
What is the primary cause of the characteristic X-ray spectrum?
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16
What is the effect on the kinetic energy of emitted photoelectrons when the intensity of incident monochromatic light is doubled?
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17
What is the standard mathematical representation of Einstein's photoelectric equation?
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18
What physical phenomenon is considered the inverse process of the photoelectric effect?
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19
Which physicist provided the theoretical explanation for the photoelectric effect?
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20
What is the term for the emission of electrons from a metal surface due to heating?
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