JEE Main 2021 (Online) 24th February Evening Shift | Atoms and Nuclei Question 108 | Physics

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JEE Main 2021 (Online) 24th February Evening Shift

MCQ (Single Correct Answer)

-1

The de-Broglie wavelength of a proton and $$\alpha$$-particle are equal. The ratio of their velocities is :

4 : 2

4 : 3

4 : 1

1 : 4

JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A, B, C, D and E.

The transitions A, B and C respectively represent :

JEE Main 2021 (Online) 24th February Morning Shift Physics - Atoms and Nuclei Question 109 English

JEE Main 2021 (Online) 24th February Morning Shift Physics - Atoms and Nuclei Question 109 English

The series limit of Lyman series, second member of Balmer series and second member of Paschen series.

The ionization potential of hydrogen, second member of Balmer series and third member of Paschen series.

The series limit of Lyman series, third member of Balmer series and second member of Paschen series.

The first member of the Lyman series, third member of Balmer series and second member of Paschen series.

JEE Main 2020 (Online) 6th September Evening Slot

MCQ (Single Correct Answer)

-1

Given the masses of various atomic particles
m_p = 1.0072 u, m_n = 1.0087 u, m_e = 0.000548 u,
$${m_{\overline v }}$$ = 0, m_d = 2.0141 u, where p $$ \equiv $$ proton, n $$ \equiv $$ neutron,
e $$ \equiv $$ electron, $$\overline v $$ $$ \equiv $$ antineutrino and d $$ \equiv $$ deuteron. Which of the following process is allowed by momentum and energy conservation?

n + n $$ \to $$ deuterium atom
(electron bound to the nucleus)

n + p $$ \to $$ d + $$\gamma $$

p $$ \to $$ n + e⁺ + $$\overline v $$

e⁺ + e^- $$ \to $$ $$\gamma $$

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

A radioactive nucleus decays by two different processes. The half life for the first process is 10 s and that for the second is 100 s. The effective half life of the nucleus is close to :

12 sec

9 sec

55 sec

6 sec

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