1

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 ____

2

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 ____

3

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 ____

4

JEE Main 2020 (Online) 5th September Morning Slot

Numerical

+4

-0

Out of Syllabus

A beam of electrons of energy E scatters from
a target having atomic spacing of 1 $$\mathop A\limits^o $$. The first
maximum intensity occurs at $$\theta $$ = 60

(Planck constant h = 6.64 × 10

1 eV = 1.6 × 10

mass m = 9.1 × 10

^{o}. Then E (in eV) is ______.(Planck constant h = 6.64 × 10

^{–34}Js,1 eV = 1.6 × 10

^{–19}J, electronmass m = 9.1 × 10

^{–31}kg)Your input ____

Questions Asked from Dual Nature of Radiation (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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