The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

The mass difference between the pair of mirror nuclei $${}_6^{11}C$$ and $${}_5^{11}B$$ is given to be Δ MeV/c². According to the semi-empirical mass formula, the mass difference between the pair of mirror nuclei $${}_9^{17}F$$ and $${}_8^{17}O$$ will approximately be (rest mass of proton m_p = 938.27 MeV/c² and rest mass of neutron m_n = 939.57 MeV/c²)

A

1.39Δ MeV/c²

B

(1.39Δ + 0.5) MeV/c²

C

1.86Δ MeV/c²

D

(1.6Δ + 0.78) MeV/c²

All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

A

Deuterium

B

Hydrogen

C

Neon

D

Helium

An electron and a proton starting from rest get accelerated through potential difference of 100kV. The final speeds of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

A

Ve > Vp

B

Ve < Vp

C

Ve = Vp

D

Cannot be determined

The Baryon number of proton, the lepton number of proton, the Baryon number of electron and the lepton number of electron are respectively

A

zero, zero, one and zero

B

one, one, zero and one

C

one, zero, zero and one

D

zero, one, one and zero

An electron and a proton starting from rest get accelerated through potential difference of 100 kV. The final speed of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?

A

Ve > Vp

B

Ve

C

Ve = Vp

D

Cannot be determined

Mass of a neutron is 1.675 × 10-27 and mass of proton is 1.672 × 10-27. Find the total mass.

A

3.347 × 10-27

B

3.337 × 10-27

C

3.447 × 10-27

D

3.357 × 10-27

Consider a nucleus with N neutrons and Z protons. If m_p, m_n and BE represents the mass of the proton, the mass of the neutron and the binding energy of the nucleus respectively and c is the velocity of light in free space, the mass of the nucleus is given by

A

Nm_n + Zm_p

B

Nm_p + Zm_n

C

Nm_n + Zm_p + $$\frac{{BE}}{{{c^2}}}$$

D

Nm_p + Zm_n + $$\frac{{BE}}{{{c^2}}}$$

What is the size of Electron as comapared to Proton and Neutron?

A

1/355

B

1/1236

C

1/1836

D

1/1923

Electron, Proton, Neutron discovered by

A

J. J. Thomson, Ernest Rutherford & James Chadwick

B

John Dalton, J.J. Thomson & Neils Bohr

C

Neils Bohr, John Dalton & J.J. Thomson

D

None of the above

Suppose that a neutron at rest in free space decays into a proton and an electron. This process would violate

A

conservation of charge

B

conservation of energy

C

conservation of linear momentum

D

conservation of angular momentum

The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

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