Atomic Physics

Q: in photoelectric effect,the energy of the electrons

(a) :  varies linearly with the frequency
(b) :  is independent of the intensity
(c) :  is dependent of the intensity
(d) :  both (a) and(b)
(e) :  None of the Above
Answer:  both (a) and(b)

Q: in the thomson model of the atom,the electrons are distributed as plum through a positive atomic pudding.what single wavelength of light would a thomson atom emit

(a) :  1184Å
(b) :  4740Å
(c) :  7100Å
(d) :  2370Å
(e) :  None of the Above
Answer:  1184Å
Explanation:  in the thomson atom,the electrons are disappeared through a positive nuclear fluid.applying gauss's law V.E=P/Ɛₒ ,∫E.da=q/Ɛₒ integrating over the inner sphere, we obtain E.4πr²=P4/3πr³/Ɛₒ E=e/4πƐₒR³

Q: compton scattering is called because

(a) :  most electron in matter are effectively free
(b) :  electrons are at rest in matters
(c) :  most electron in matter are effectively free and at rest
(d) :  none of these
(e) :  None of the Above
Answer:  most electron in matter are effectively free and at rest

Q: an atom has three of states valence electrons in p shell.determine the total number os state in this configuration.that is,how many distinct three electron states can be constructed from the orbits in a p-shell

(a) :  5
(b) :  4
(c) :  20
(d) :  13
(e) :  None of the Above
Answer:  20
Explanation:  the s shell has l=0 and the p shell has l=1 hence m₁=-1,0,1.the possible states taking each electron seperately are then where the first electron is on the first line the second electron I the second line-,the third electron in the third line .we count states with two electrons in one state and the other electron separate.hence there are total of 20 states as expect from the binomial coefficient (6 3)=61/3131=20

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