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1
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
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A proton moving with one tenth of velocity of light has a certain de Broglie wavelength of $$\lambda$$. An alpha particle having certain kinetic energy has the same de-Brogle wavelength $$\lambda$$. The ratio of kinetic energy of proton and that of alpha particle is:

A
1 : 4
B
2 : 1
C
4 : 1
D
1 : 2
2
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II :

List I List II
A. Microwaves I. Radio active decay of the nucleus
B. Gamma rays II. Rapid acceleration and deceleration of electron in aerials
C. Radio waves III. Inner shell electrons
D. X-rays IV. Klystron valve

Choose the correct answer from the options given below :

A
A-I, B-III, C-IV, D-II
B
A-IV, B-III, C-II, D-I
C
A-IV, B-I, C-II, D-III
D
A-I, B-II, C-III, D-IV
3
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The mass of proton, neutron and helium nucleus are respectively $$1.0073~u,1.0087~u$$ and $$4.0015~u$$. The binding energy of helium nucleus is :

A
$$28.4~\mathrm{MeV}$$
B
$$56.8~\mathrm{MeV}$$
C
$$7.1~\mathrm{MeV}$$
D
$$14.2~\mathrm{MeV}$$
4
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The radius of electron's second stationary orbit in Bohr's atom is R. The radius of 3rd orbit will be
A
2.25R
B
$3 \mathrm{R}$
C
$\frac{\mathrm{R}}{3}$
D
$9 \mathrm{R}$
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