1

JEE Main 2021 (Online) 16th March Morning Shift

Numerical

+4

-1

When light of wavelength 248 nm falls on a metal of threshold energy 3.0 eV, the de-Broglie wavelength of emitted electrons is _______$$\mathop A\limits^o $$. (Round off to the Nearest Integer).

[ Use : $$\sqrt 3 $$ = 1.73, h = 6.63 $$\times$$ 10

m

[ Use : $$\sqrt 3 $$ = 1.73, h = 6.63 $$\times$$ 10

^{$$-$$34}Jsm

_{e}= 9.1 $$\times$$ 10^{$$-$$31}kg; c = 3.0 $$\times$$ 10^{8}ms^{$$-$$1}; 1eV = 1.6 $$\times$$ 10^{$$-$$19}J]Your input ____

2

JEE Main 2021 (Online) 26th February Evening Shift

Numerical

+4

-1

A ball weighing 10 g is moving with a velocity of 90 ms

[Given : h = 6.63 $$\times$$ 10

^{$$-$$1}. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ___________ $$\times$$ 10^{$$-$$33}m. (Rounded off to the nearest integer)[Given : h = 6.63 $$\times$$ 10

^{$$-$$34}Js]Your input ____

3

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

Electromagnetic radiation of wavelength 663 nm is just sufficient to ionise the atom of metal A. The ionization enegy of metal A in kJ mol

[h = 6.63 $$\times$$ 10

^{$$-$$1}is __________. (Rounded off to the nearest integer)[h = 6.63 $$\times$$ 10

^{$$-$$34}Js, c = 3.00 $$\times$$ 10^{8}ms^{$$-$$1}, N_{A}= 6.02 $$\times$$ 10^{23}mol^{$$-$$1}]Your input ____

4

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 ____

Questions Asked from Structure of Atom (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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