JEE Main 2022 (Online) 28th June Morning Shift | Atoms and Nuclei Question 53 | Physics

JEE Main 2022 (Online) 28th June Morning Shift

MCQ (Single Correct Answer)

-1

The de Broglie wavelengths for an electron and a photon are $$\lambda$$_e and $$\lambda$$_p respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two ?

$${\lambda _p} \propto \lambda _e^2$$

$${\lambda _p} \propto {\lambda _e}$$

$${\lambda _p} \propto \sqrt {{\lambda _e}} $$

$${\lambda _p} \propto \sqrt {{1 \over {{\lambda _e}}}} $$

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-1

Match List-I with List-II :

	List - I		List - II
(a)	Ultraviolet rays	(i)	Study crystal structure
(b)	Microwaves	(ii)	Greenhouse effect
(c)	Infrared rays	(iii)	Sterilizing surgical instrument
(d)	X-rays	(iv)	Radar system

Choose the correct answer from the options given below :

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-1

An $$\alpha$$ particle and a carbon 12 atom has same kinetic energy K. The ratio of their de-Broglie wavelengths $$({\lambda _\alpha }:{\lambda _{C12}})$$ is :

$$1:\sqrt 3 $$

$$\sqrt 3 :1$$

$$3:1$$

$$2:\sqrt 3 $$

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-1

A hydrogen atom in its ground state absorbs 10.2 eV of energy. The angular momentum of electron of the hydrogen atom will increase by the value of :

(Given, Planck's constant = 6.6 $$\times$$ 10^$$-$$34 Js).

2.10 $$\times$$ 10^$$-$$34 Js

1.05 $$\times$$ 10^$$-$$34 Js

3.15 $$\times$$ 10^$$-$$34 Js