In radioactive disintegration ?-rays emission is always accompanied by
A.?-ray emission
B.y-ray emission
C.neutron emission
D.none of the above
Category: Nuclear Engineering Mcqs
The ratio of the specific charge e/m of a proton to that of an alpha particle is
A.1:20
B.1:40
C.4:10
D.2:10
The antiparticle of electron is
A.proton
B.positron
C.antiproton
D.neutron
The average life of a radioactive atom is Where T + half-life period
A.T/1.44
B.1.44T
C.0.144 T
D.14.4 T
The half-life period of a radioactive isotope is 24 days. It would be 75% decomposed in
A.12 days
B.24 days
C.36 days
D.40 days
A proton is identical with
A.ionised hydrogen molecule
B.the nucleus of hydrogen atom
C.the nucleus of deuterium
D.an ?-ray particle
The positron is almost as heavy as
A.an electron
B.a proton
C.a neutron
D.a meson
In an ?-decay the ratio of neutron to proton
A.decreases
B.increases
C.remains unchanged
D.may decrease or increase
Maximum density of heavy water is at
A.0?C
B.4?C
C.11.6?C
D.3.8?C
Gamma rays are
A.high energy electrons
B.high energy electromagnetic waves
C.low energy electrons
D.low energy electromagnetic waves
