1
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 ?

A
$${\lambda _p} \propto \lambda _e^2$$
B
$${\lambda _p} \propto {\lambda _e}$$
C
$${\lambda _p} \propto \sqrt {{\lambda _e}} $$
D
$${\lambda _p} \propto \sqrt {{1 \over {{\lambda _e}}}} $$
2
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
C
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
D
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
3
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 :

A
$$1:\sqrt 3 $$
B
$$\sqrt 3 :1$$
C
$$3:1$$
D
$$2:\sqrt 3 $$
4
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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).

A
2.10 $$\times$$ 10$$-$$34 Js
B
1.05 $$\times$$ 10$$-$$34 Js
C
3.15 $$\times$$ 10$$-$$34 Js
D
4.2 $$\times$$ 10$$-$$34 Js
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