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Day 96: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Atoms. Asked 2 times: 2021 Paper 18*, 1 Feb 2024 (* = numbers or wording changed that year) See all 2 times it was asked

    115
    A particular hydrogen - like ion emits the radiation of frequency 3×1015 Hz3 \times10^{15}\text{ }Hz when it makes transition from n=2n = 2 to n=1n = 1. The frequency of radiation emitted in transition from n=3n = 3 to n=1n = 1 is x9×1015 Hz\frac{x}{9}\times10^{15}\text{ }Hz, when x=x = ________ .

  2. Question 2

    Atoms. Asked 2 times: 29 Jan 2024, 1 Feb 2024 See all 2 times it was asked

    19
    The minimum energy required by a hydrogen atom in ground state to emit radiation in Balmer series is nearly:

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  3. Question 3

    Dual Nature of Radiation and Matter. Asked 2 times: 2021 Paper 2*, 1 Feb 2024 (* = numbers or wording changed that year) See all 2 times it was asked

    11
    The de Broglie wavelengths of a proton and an α\alpha particle are λ\lambda and 2λ2\lambda respectively. The ratio of the velocities of proton and α\alpha particle will be:

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  4. Question 4

    Electrostatics. Asked 2 times: 30 Jan 2024*, 1 Feb 2024 (* = numbers or wording changed that year) See all 2 times it was asked

    24
    Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle θ\theta with each other. When suspended in water the angle remains the same. If density of the material of the sphere is 1.5 g/cc1.5\text{ }g/cc, the dielectric constant of water will be ______ (Take density of water =1 g/cc= 1\text{ }g/cc )

  5. Question 5

    Oscillations. Asked 2 times: 25 Jul 2022, 1 Feb 2024 See all 2 times it was asked

    2
    If RR is the radius of the earth and the acceleration due to gravity on the surface of earth is g=π2 m/s2g=\pi^{2}\text{ }m/s^{2}, then the length of the second's pendulum at a height h=2Rh= 2R from the surface of earth will be,

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