JEE Main 2022 (Online) 24th June Morning Shift | Dual Nature of Radiation Question 30 | Physics

JEE Main 2022 (Online) 24th June Morning Shift

MCQ (Single Correct Answer)

-1

Nucleus A is having mass number 220 and its binding energy per nucleon is 5.6 MeV. It splits in two fragments 'B' and 'C' of mass numbers 105 and 115. The binding energy of nucleons in 'B' and 'C' is 6.4 MeV per nucleon. The energy Q released per fission will be :

0.8 MeV

275 MeV

220 MeV

176 MeV

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

The temperature of an ideal gas in 3-dimensions is 300 K. The corresponding de-Broglie wavelength of the electron approximately at 300 K, is :

[m_e = mass of electron = 9 $$\times$$ 10^$$-$$31 kg, h = Planck constant = 6.6 $$\times$$ 6.6 $$\times$$ 10^$$-$$34 Js, k_B = Boltzmann constant = 1.38 $$\times$$ 10^$$-$$23 JK^$$-$$1]

6.26 nm

8.46 nm

2.26 nm

3.25 nm

JEE Main 2021 (Online) 1st September Evening Shift

MCQ (Single Correct Answer)

-1

The half life period of radioactive element x is same as the mean life time of another radioactive element y. Initially they have the same number of atoms. Then :

x-will decay faster than y.

y-will decay faster than x.

x and y have same decay rate initially and later on different decay rate.

x and y decay at the same rate always.

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

-1

A free electron of 2.6 eV energy collides with a H⁺ ion. This results in the formation of a hydrogen atom in the first excited state and a photon is released. Find the frequency of the emitted photon. (h = 6.6 $$\times$$ 10^$$-$$34 Js)

1.45 $$\times$$ 10¹⁶ MHz

0.19 $$\times$$ 10¹⁵ MHz

1.45 $$\times$$ 10⁹ MHz

9.0 $$\times$$ 10²⁷ MHz

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