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 E1 = 4 eV and E2 = 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 $$\theta $$ = 60o. Then E (in
eV) is ______.
(Planck constant h = 6.64 × 10–34 Js,
1 eV = 1.6 × 10–19 J, electron
mass m = 9.1 × 10–31 kg)
(Planck constant h = 6.64 × 10–34 Js,
1 eV = 1.6 × 10–19 J, electron
mass 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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