1

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

A light beam of wavelength 500 nm is incident on a metal having work function of 1.25 eV, placed in a magnetic field of intensity B. The electrons emitted perpendicular to the magnetic field B, with maximum kinetic energy are bent into circular are of radius 30 cm. The value of B is ___________ $$\times$$ 10

Given hc = 20 $$\times$$ 10

^{$$-$$7}T.Given hc = 20 $$\times$$ 10

^{$$-$$26}J-m, mass of electron = 9 $$\times$$ 10^{$$-$$31}kgYour input ____

2

JEE Main 2021 (Online) 20th July Evening Shift

Numerical

+4

-1

A certain metallic surface is illuminated by monochromatic radiation of wavelength $$\lambda$$. The stopping potential for photoelectric current for this radiation is 3V

_{0}. If the same surface is illuminated with a radiation of wavelength 2$$\lambda$$, the stopping potential is V_{0}. The threshold wavelength of this surface for photoelectric effect is ____________ $$\lambda$$.Your input ____

3

JEE Main 2021 (Online) 26th February Evening Shift

Numerical

+4

-1

Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the metal surface successively. The value of ratio of maximum velocities of the photoelectrons emitted in the two respective cases is x : y. The value of x is ___________.

Your input ____

4

JEE Main 2020 (Online) 5th September Evening Slot

Numerical

+4

-0

The surface of a metal is illuminated alternately
with photons of energies E

_{1}= 4 eV and E_{2}= 2.5 eV respectively. The ratio of maximum speeds of the photoelectrons emitted in the two cases is 2. The work function of the metal in (eV) is _____.Your input ____

Questions Asked from Dual Nature of Radiation (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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