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Whether photoemission occurs for a given wavelength and work function

This type of question, asked 3 times: 29 Jan 2023, 31 Jan 2023, 22 Jan 2025. All 3 questions below, oldest first.

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  1. Question 1

    29 Jan 2023

    2
    The threshold wavelength for photoelectric emission from a material is 5500 A˚5500\text{ Å}. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a (A) 75 W75\text{ }W infra -red lamp (B) 10 W10\text{ }W infra-red lamp (C) 75 W75\text{ }W ultra - violet lamp (D) 10 W10\text{ }W ultra-violet lamp Choose the correct answer from the options given below:

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  2. Question 2

    31 Jan 2023

    92
    If the two metals AA and BB are exposed to radiation of wavelength 350 nm350\text{ }nm. The work functions of metals A and B are 4.8eV and 2.2eV. Then choose the correct option.

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  3. Question 3

    22 Jan 2025

    14
    The work functions of cesium (Cs) and lithium ( Li ) metals are 1.9 eV and 2.5 eV , respectively. If we incident a light of wavelength 550 nm on these two-metal surface, then photo-electric effect is possible for the case of

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