1

JEE Main 2021 (Online) 27th August Morning Shift

Numerical

+4

-1

The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is equal to $${{{h^2}} \over {xma_0^2}}$$. The value of 10x is ___________. (a

_{0}is radius of Bohr's orbit) (Nearest integer) [Given : $$\pi$$ = 3.14]Your input ____

2

JEE Main 2021 (Online) 26th August Evening Shift

Numerical

+4

-1

A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 $$\times$$ 10

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

^{14}Hz. The velocity of ejected electron is ____________ $$\times$$ 10^{5}ms^{$$-$$1}(Nearest integer)[Use : h = 6.63 $$\times$$ 10

^{$$-$$34}Js, m_{e}= 9.0 $$\times$$ 10^{$$-$$31}kg]Your input ____

3

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

An accelerated electron has a speed of 5 $$\times$$ 10

[Use mass of electron = 9.1 $$\times$$ 10

^{6}ms^{$$-$$1}with an uncertainty of 0.02%. The uncertainty in finding its location while in motion is x $$\times$$ 10^{$$-$$9}m. The value of x is ____________. (Nearest integer)[Use mass of electron = 9.1 $$\times$$ 10

^{$$-$$31}kg, h =6.63 $$\times$$ 10^{$$-$$34}Js, $$\pi$$ = 3.14]Your input ____

4

JEE Main 2021 (Online) 25th July Morning Shift

Numerical

+4

-1

A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface of sodium, x $$\times$$ 10

(h = 6.626 $$\times$$ 10

^{20}electrons are ejected per second. Assume that wavelength 400 nm is sufficient for ejection of electron from the surface of sodium metal. The value of x is ______________. (Nearest integer)(h = 6.626 $$\times$$ 10

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

Questions Asked from Structure of Atom (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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