1
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : In hydrogen atom, the frequency of radiation emitted when an electron jumps from lower energy orbit (E1) to higher energy orbit (E2), is given as hf = E1 $$-$$ E2

Statement II : The jumping of electron from higher energy orbit (E2) to lower energy orbit (E1) is associated with frequency of radiation given as f = (E2 $$-$$ E1)/h

This condition is Bohr's frequency condition.

In the light of the above statements, choose the correct answer from the options given below :

A
Both Statement I and Statement II are true.
B
Both Statement I and Statement II are false.
C
Statement I is correct but Statement II is false.
D
Statement I is incorrect but Statement II is true.
2
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
3
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

A radioactive nucleus can decay by two different processes. Half-life for the first process is 3.0 hours while it is 4.5 hours for the second process. The effective half-life of the nucleus will be:

A
3.75 hours
B
0.56 hours
C
0.26 hours
D
1.80 hours
4
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

How many alpha and beta particles are emitted when Uranium 92U238 decays to lead 82Pb206 ?

A
3 alpha particles and 5 beta particles
B
6 alpha particles and 4 beta particles
C
4 alpha particles and 5 beta particles
D
8 alpha particles and 6 beta particles
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