PYQ Vault
EbooksTutor

de Broglie wavelength or momentum of a particle (wavelength = h/mv)

This type of question, asked 4 times: 2 May 2023 S2, 16 May 2023 S2, 15 Apr 2026 S1, 15 Apr 2026 S2. All 4 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    2 May 2023 S2

    92
    What is the momentum of a microscopic particle having de Broglie's wavelength 6.0 A˚6.0\,\text{Å}? (h=6.63×10−34 Jsh = 6.63 \times 10^{-34}\,\text{Js})

    Tap an option to check your answer.

  2. Question 2

    16 May 2023 S2

    56
    What is de Broglie's wavelength for a particle having mass 6.64×10−276.64 \times 10^{-27} kg moving with velocity of 3×1033 \times 10^3 m s−1^{-1}? (h=6.63×10−34h = 6.63 \times 10^{-34} J s)

    Tap an option to check your answer.

  3. Question 3

    15 Apr 2026 S1

    2
    Calculate the de Broglie wavelength of an electron in the first Bohr orbit of a hydrogen atom if the velocity of an electron in the first orbit is 2.2×106 ms−12.2 \times 10^{6}\ \mathrm{ms^{-1}}. [mass of electron =9.1×10−31= 9.1 \times 10^{-31} kg, plank's constant (h) =6.626×10−34= 6.626 \times 10^{-34} J s]

    Tap an option to check your answer.

  4. Question 4

    15 Apr 2026 S2

    3
    If the velocity of the electron in Bohr's first orbit is 2.19×106 Ms−12.19 \times 10^6\ \mathrm{Ms^{-1}}, Calculate the de Broglie wavelength associated with it. [h=6.626×10−34[h = 6.626 \times 10^{-34} J s & Mass of electrons =9.10938×10−31= 9.10938 \times 10^{-31} kg ]]

    Tap an option to check your answer.