1

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 ____

2

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 ____

3

JEE Main 2020 (Online) 7th January Morning Slot

Numerical

+4

-0

A beam of electromagnetic radiation of intensity 6.4 × 10

^{–5}W/cm^{2}is comprised of wavelength, $$\lambda $$ = 310 nm. It falls normally on a metal (work function $$\phi $$ = 2eV) of surface area of 1 cm^{2}. If one in 10^{3}photons ejects an elctron, total number of electrons ejected in 1 s is 10^{x}. (hc = 1240 eVnm, 1eV = 1.6 × 10^{–19}J), then x is _____.Your input ____

Questions Asked from Dual Nature of Radiation (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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