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 3V0. If the same surface is illuminated with a radiation of wavelength 2$$\lambda$$, the stopping potential is V0. The threshold wavelength of this surface for photoelectric effect is ____________ $$\lambda$$.
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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 ___________.
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3
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 _____.
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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 $$\theta $$ = 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)
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