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Nuclear Physics

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Q.

A freshly prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safety with this source is  

Q.

The decay constant of a radioactive sample is . The half-life and mean-life of the sample are (respectively) given by :

Q.

After 280 days, the activity of a radioactive sample is 600 dps. The activity reduces to 3000 dps after another 140 days. The initial activity of the sample in dps is :

Q.

The Wavelength  X-rays for lead isotopes  and  respectively. Match the statements of the two columns:

                    Column 1

                    Column 2

 (A)

  

 (p)

  

 (B)

  

 (q)

  

 (C)

  

 (r)

  

 (D)

  

 (s)

  

 

Q. A neutron have K.E. 15 eV suffers head on collision with hydrogen atom in ground state at rest then after collision K.E. of?

K < = 20.2 eV

=> no excitation of hydrogen atom

=>collision will be elastic ​

Q. an I convert kg to amu nd then multiply del m by 931.5MeV?

Yes

Q. Half life of a radioactive sulistance A is 4 days. The probability that a nucleus will dacay in two half lives is?

After two half lives 1/4 th fraction of nuclie will remain undecayed. Or 3/4th fraction will decay. Hance the probability that a nucleus in decays in two half lives is 3/4.

Q. A radioactivity sample contains 2.2 mg of pure Carbon which has half-life period of 1224 seconds. Calculate the number of atoms present initially. Which formula we can used here?

from 2.2 miligm find the no of moles and then multiply it with avogado number to find no. of atoms

Q. Light from a 100-watt filament bulb is passed through an evacuated glass tube containing sodium vapour at a high temperature. If the transmitted light is viewed through a spectrometer, we will observe
A. D1 and D2 lines of sodium with good intensity
B. dark lines where D1 and D2 lines should have been observed
C. continuous radiation from the bulb only
D. the entire emission spectrum of sodium?

option A is the right answer, D1 and D2 lines are observed