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Sources that produce the different EM waves

This type of question, asked 4 times: 2021 Paper 2, 1 Feb 2023, 8 Apr 2023, 24 Jan 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    2021 Paper 2

    8
    Match List - I with List - II.
    List - IList - II
    (A) Source of microwave frequency(i) Radioactive decay of nucleus
    (B) Source of infrared frequency(ii) Magnetron
    (C) Source of Gamma Rays(iii) Inner shell electrons
    (D) Source of X-rays(iv) Vibration of atoms and molecules
    (v) LASER
    (vi) RC circuit
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  2. Question 2

    1 Feb 2023

    11
    Match List I with List II:
    List IList II
    (A) Microwaves(I) Radioactive decay of the nucleus
    (B) Gamma rays(II) Rapid acceleration and deceleration of electron in aerials
    (C) Radio waves(III) Inner shell electrons
    (D) X-rays(IV) Klystron valve
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  3. Question 3

    8 Apr 2023

    104
    The waves emitted when a metal target is bombarded with high energy electrons are

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  4. Question 4

    24 Jan 2026 S1

    10
    Match the List-I with List-II
    List-IList-II
    (A) Radio-wave(I) is produced by Magnetron valve
    (B) Micro-wave(II) Due to change in the vibrational modes of atoms
    (C) Infrared-wave(III) Due to inner shell electrons moving from higher energy level to lower energy level
    (D) X-ray(IV) Due to rapid acceleration of electrons
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