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Day 541: JEE Mains Physics

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

  1. Question 1

    Work, Energy and Power. Asked once: 6 Apr 2023

    23
    A particle of mass 10 g10\text{ }g moves in a straight line with retardation 2x2x, where xx is the displacement in SI units. Its loss of kinetic energy for above displacement is (10x)−nJ\left( \frac{10}{x} \right)^{- n}J. The value of nn will be____

  2. Question 2

    Atoms. Asked once: 2021 Paper 23

    5
    A free electron of 2.6eV2.6eV energy collides with a H+H^{+}ion. This results in the formation of a hydrogen atom in the first excited state and a photon is released. Find the frequency of the emitted photon. (h=6.6×10−34Js)\left( h = 6.6 \times10^{- 34}Js \right)

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  3. Question 3

    Current Electricity. Asked once: 2 Apr 2025

    8
    The battery of a mobile phone is rated as 4.2 V , 5800 mAh . How much energy is stored in it when fully charged?

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  4. Question 4

    Dual Nature of Radiation and Matter. Asked once: 2021 Paper 17

    1
    An electron and proton are separated by a large distance. The electron starts approaching the proton with energy 3eV3eV. The proton captures the electrons and forms a hydrogen atom in second excited state. The resulting photon is incident on a photosensitive metal of threshold wavelength 4000Å4000\text{Å}. What is the maximum kinetic energy of the emitted photoelectron?

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  5. Question 5

    Electrostatics. Asked once: 2 Apr 2025

    95
    Consider a circular loop that is uniformly charged and has a radius a2a\sqrt{2}. Find the position along the positive zz-axis of the cartesian coordinate system where the electric field is maximum if the ring was assumed to be placed in xy-plane at the origin :

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