Half life of rdioactive material is 4 hour. Then full life
In Beta decay(negative) , the neutron number in the product nucleus
Protons and neutrons are constituent particles of deuteron. It is observed that
which of the folowing can be used as neutron absorber
fission of U (235) can take place with neutron having K.E about
Neutron produced in the following fission reaction are
92U235 +0n1 -----> 54Xe140 + 38Sr94 + (neutrons)
According to Einstein's energy mass equation , 931MeV energy is equivalent to
5B10 is bombarded with neutrons and alpha particles are observed to be emitted. What is the residual nucleus
The life time of mostly excited states is only about
In heavy atom, the transition of inner shell elctron give rise to emission of
According the Bohr's Theory, the angular momentum of electron in the 2nd orbit is
The gamma rays differ from x-rays because
In Bohr's atomic model , the elctron does not fall in to nucleus because
The metastable state are the
P.E of elctron in the nth orbit of hydrogen atom is given by
In LASER operation de excitation of an atom is caused by an incident photon which
for the production of x-rays elctrons "e" is accelerated through a potential difference of V . The x-ray thus produced have wavelengh .(c is velocity of light)
Dimensional unit of Planck's constant is same as that of
The energy of x-rays emitted from x-rasys tube can be increased by
moderator of fission reaction is
neutron is