1) When a photon scatters by a non-zero angle after colliding with an electron a

Question

1) When a photon scatters by a non-zero angle after colliding with an electron at rest,
like in the Compton effect, its wavelength will
a) decrease b) increase
c) stay the same d) decrease or increase depending on the angle

2) Consider the following statements:
I. The kinetic energy of the photoelectrons increases if the photon intensity increases.
II. Increasing the frequency of the photons increases the kinetic energy of the
photoelectrons.
III. Photons of any frequency can eject electrons.
IV. Only photons of frequencies above a minimal one can eject electrons.

The correct statement(s) is (are):

Lifesaver will be awarded

Explanation / Answer

1 .

- 0 = h / mc [ 1 - cos ] ;

= h / mc [ 1 - cos ] + 0 ;

so the wavelength increases ;   

b . increses <----------ans

2 .

I . if intesity increses , then , the no of photons increases, not their KE , so this statement is false

II. K = hv - hv0 ;

so as one increses v , K also increses ,

so this statment is TRUE

III .

K = hv - hv0 ;

K = h ( v - v0 ) ;

so if v < v0 , then K < 0 which is not possible ,

so no photoelectrons will be ejected if v < v0 ;

hence the statement is FALSE

IV .

TRUE as expalined in III .

true sentences : number II and number IV <-------------ans

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