Q.1
) 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. Ionization Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10⁻²⁷ kg. The quantum number of the two levels in the emission
  • a) n=1 , n=3
  • b) n=2 , n=4
  • c) n=1 , n=4
  • d) n=3 , n=4
Q.2
) 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. Ionigation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10⁻²⁷ kg. In this transition change in the angular momentum of electron is (where h isPlank constanst )
  • a)h / 2π
  • b) h / π
  • c)2h / π
  • d)3h / 2π
Q.3
)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. Ionigation 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 caussing that is at lest before the transitionis of the order of
  • a) 1 cm /s
  • b) 102 m / s
  • c)104 m / s
  • d)1 m /s
Q.4
Suppose the charge of a proton and an electron differslightly. One of them is–e, the other is (e + Δe). Ifthe net of electrostatic force and gravitational forcebetween two hydrogen atoms placed at a distanced (much greater than atomic size) apart is zero,then Δe is of the order of [Given mass of hydrogen mh = 1.67 × 10⁻²⁷ kg]
  • a) a) 10–20 C
  • b) 10–23 C
  • c) 10–37 C
  • d) 10–47 C
Q.5
The energy released by fission of one atom of 92U235 is 200 MeV. The number of fission required per second to produce a power of 1kW is ..[ AFMC 2001]
  • a)3.125×109
  • b)3.125×1012
  • c)3.125×1013
  • d)3.125×1011
Q.6
Assuming that about 200 MeV energy is released per fission of 92U235 nuclei. What would be the mass of U-235 consumed per day in the fission reactor of power 1MW approximately
  • a) 10 kg
  • b) 100kg
  • c) 1 g
  • d) 10-2g
Q.7
) The kinetic energy of an electron which is accelerated through a potential difference of 100V is [ AFMC 2010]
  • a)6.626 × 103 watt
  • b) 1.16 × 10⁻³⁴ J
  • c)418.6 cal
  • d)1.6 × 10⁻¹⁷ J
Q.8
) In the following nuclear fusion reaction the repalsive potential energy between the two fusing nucler is 7.7× 10⁻¹⁴ J The Temperature to which the gas must be heated is nearly (Boltzman constmt K=1.38 × 10⁻²³ J / K )
ch-19_que_no-132_img_no1.png
  • a) 103K
  • b) 105K
  • c) 107K
  • d) 109K
Q.9
) An electron Passing through a Potential diffencne of 4.9 v colides with a mercury atom and trnasfer it to the first excited state what is trnasfer it to the first excited state. what is the wave length of Photon corresponding to the franition of mercury atom to its normal state.
  • a) 2050A
  • b) 2935A
  • c)2525A
  • d)2240A
0 h : 0 m : 1 s