1

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 ____

2

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 ____

3

JEE Main 2020 (Online) 5th September Morning Slot

Numerical

+4

-0

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 ____

4

JEE Main 2020 (Online) 2nd September Morning Slot

Numerical

+4

-0

When radiation of wavelength $$\lambda $$ is used to
illuminate a metallic surface, the stopping
potential is V. When the same surface is
illuminated with radiation of wavelength 3$$\lambda $$,
the stopping potential is
$${V \over 4}$$. If the threshold
wavelength for the metallic surface is n$$\lambda $$ then
value of n will be __________.

Your input ____

Questions Asked from Dual Nature of Radiation (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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