JEE Main 2021 (Online) 20th July Morning Shift | Atoms and Nuclei Question 160 | Physics

A radioactive material decays by simultaneous emissions of two particles with half lives of 1400 years and 700 years respectively. What will be the time after which one third of the material remains ? (Take ln 3 = 1.1)

740 years

1110 years

700 years

340 years

JEE Main 2021 (Online) 20th July Morning Shift

MCQ (Single Correct Answer)

-1

A nucleus of mass M emits $$\gamma$$ -ray photon of frequency 'v'. The loss of internal energy by the nucleus is :

[Take 'c' as the speed of electromagnetic wave]

$$hv\left[ {1 + {{hv} \over {2M{c^2}}}} \right]$$

$$hv\left[ {1 - {{hv} \over {2M{c^2}}}} \right]$$

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The decay of a proton to neutron is :

always possible as it is associated only with $$\beta$$⁺ decay

possible only inside the nucleus

not possible as proton mass is less than the neutron mass

not possible but neutron to proton conversation is possible

JEE Main 2021 (Online) 18th March Morning Shift

MCQ (Single Correct Answer)

-1

Imagine that the electron in a hydrogen atom is replaced by a muon ($$\mu$$). The mass of muon particle is 207 times that of an electron and charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be :

13.6 eV

2815.2 eV

331.2 eV

27.2 eV

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