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Day 161: JEE Mains Physics

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

  1. Question 1

    Wave Optics. Asked once: 29 Jan 2024 (same type asked 5 times) See all 5 of this type

    26
    In a double slit experiment shown in figure, when light of wavelength 400 nm400\text{ }nm is used, dark fringe is observed at PP. If D=0.2 mD = 0.2\text{ }m. the minimum distance between the slits S1S_{1} and S2S_{2} is ____ mmmm.

  2. Question 2

    Atoms. Asked once: 6 Apr 2024 (same type asked 5 times) See all 5 of this type

    111
    In Franck-Hertz experiment, the first dip in the current-voltage graph for hydrogen is observed at 10.2 V. The wavelength of light emitted by hydrogen atom when excited to the first excitation level is _____ nmnm. (Given hc =1245eVnm,e=1.6×10−19C= 1245eVnm,e = 1.6 \times10^{- 19}C ).

  3. Question 3

    Dual Nature of Radiation and Matter. Asked once: 23 Jan 2025 (same type asked 5 times) See all 5 of this type

    81
    In photoelectric effect an em-wave is incident on a metal surface and electrons are ejected from the surface. If the work function of the metal is 2.14 eV and stopping potential is 2 V , what is the wavelength of the em-wave? (Given hc =1242eVnm= 1242eVnm where h is the Planck's constant and c is the speed of light in vaccum.)

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  4. Question 4

    Electromagnetic Waves. Asked once: 23 Jan 2025 (same type asked 5 times) See all 5 of this type

    99
    A time varying potential difference is applied between the plates of a parallel plate capacitor of capacitance 2.5μ F2.5\mu\text{ }F. The dielectric constant of the medium between the capacitor plates is 1 . It produces an instantaneous displacement current of 0.25 mA in the intervening space between the capacitor plates, the magnitude of the rate of change of the potential difference will be ____\_\_\_\_ Vs−1Vs^{- 1}.

  5. Question 5

    Wave Optics. Asked once: 24 Jan 2025 (same type asked 5 times) See all 5 of this type

    76
    Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be :

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