Radioactivity

Phenomena of radioactivity was discovered by Henri Becquerel in

A. 1896

B. 1895

C. 1894

D. 1893

Particles like kaons and muons etc, were found out by

A. looking at cosmic rays

B. looking at particles in accelerators

C. looking closely at atom

D. both A and B

Most of the space in an atom is

A. filled with positive charge

B. empty

C. filled with negative charge

D. filled with neutrons

The nucleon number consists of

A. Number of electrons

B. Number of protons

C. Number of electrons and protons

D. Number of protons and neutrons

Gamma radiation is emitted in order to

A. excite the atom

B. release excess energy from atom

C. destabilize the atom

D. stabilize the atom

Strongest ionizing radiation is

A. Alpha

B. beta

C. gamma

D. x-rays

A decay in which a proton decays in to neutron and an electron neutrino is

A. β⁺ decay

B. β^–

C. γ decay

D. α decay

Lepton among them are

A. electrons

B. neutrinos

C. protons

D. both A and B

Radiations emitted by radioactive substances is

A. alpha

B. beta

C. gamma

D. all of above

Particles that are un affected by strong nuclear force are

A. protons

B. leptons

C. neutrons

D. bosons