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Atoms and Nucle...

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  • Question 1
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    Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10–27 Kg
    The recoil speed of emitting atom causing that is at lest before the transition is of the order of

  • Question 2
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    A and B are two radioactive substane whose half lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time after which they will have same quantity remaining is

  • Question 3
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    The activity of a sample of a radio- active material is at time t1 and A2 at time t2 (where t2 > t1) if T its mean life is then

  • Question 4
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  • Question 5
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    gf 92U238 undergoes sucesively 8 α decays and 6 β decays then resulting nucleus is

  • Question 6
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    The energy released by the fission of one uranium atom is 200 MeV. The number of fission Per second required to Produce 3.2 w of Power is

  • Question 7
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    Radio carbon dating is done by estimating in the specimen

  • Question 8
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    The total energy of the electron in the first excited state of hydrogen is –3.4 eV. what is the kinetic energy of the electron in this state?

  • Question 9
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    The wave length of second line of Balmer series is 486.4 nm. what is the wave length of the first line of lyman series ?

  • Question 10
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    The innermost orbit of the hydrogen atom has a radius 0.53 A. what is radius of 2nd orbit is ?

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