Radioactivity

Phenomena of radioactivity was discovered by Henri Becquerel in

A. 1896

B. 1895

C. 1894

D. 1893

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

Number of protons in an atom determine

A. chemical properties

B. physical properties

C. magnetic properties

D. electrical properties

A proton is made up of

A. one up quark and two down quarks

B. an up quark and down antiquark

C. two up quarks and a down quark

D. strange quark and an anti-strange quark

Type of rays that affect the nucleus are

A. alpha

B. beta

C. gamma

D. EM

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

Force that acts on both quarks and leptons is

A. strong nuclear force

B. weak interaction

C. intermediate interaction

D. nuclear force

Radius of nucleus ranges from

A. 10^-15 m

B. 10^-15 m to 10^-14 m

C. 10^-10 m

D. 10^-10 m to 10^-6 m

β^– radiations are simply

A. protons

B. neutrons

C. electrons

D. muons

Alpha particles have relatively

A. low kinetic energies

B. high potential energy

C. high mechanical energy

D. high kinetic energy