physics Online Test

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

























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atomic spectra and nuclear physics

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Hafiz Shehbaz Ali
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