1

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is _________. (Integer answer)

(A) Li

(B) Na

(C) Rb

(D) Cs

(A) Li

(B) Na

(C) Rb

(D) Cs

Your input ____

2

JEE Main 2021 (Online) 24th February Morning Shift

Numerical

+4

-1

A proton and a Li

The value of x is ______. (Rounded off to the nearest integer)

[Mass of Li

^{3+}nucleus are accelerated by the same potential. If $$\lambda _{Li}$$ and $$\lambda _p$$ denote the de Broglie wavelengths of Li^{3+}and proton respectively, then the value of $${{{\lambda _{Li}}} \over {{\lambda _p}}}$$ is x $$ \times $$ 10^{-1}.The value of x is ______. (Rounded off to the nearest integer)

[Mass of Li

^{3+}= 8.3 mass of proton]Your input ____

3

JEE Main 2020 (Online) 2nd September Evening Slot

Numerical

+4

-0

The work function of sodium metal is
4.41 $$ \times $$ 10

^{–19}J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (h = 6.63 $$ \times $$ 10^{–34}J s; c = 3 $$ \times $$ 10^{8}m/s) ________ × 10^{–21}J.Your input ____

Questions Asked from Structure of Atom (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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