Photoelectric EffectHard

Question

Given curve shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes A and B. The dark curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA . Similarly dotted curve is for tube B. These quantities are VB and ZB for the tube B. Then,

Options

A.VA > VB, ZA > ZB
B.VA > VB, ZA < ZB
C.VA < VB, ZA > ZB
D.VA < VB, ZA < ZB

Solution

(λkα)A > (λka)B     ⇒    ZB > ZA
(λ off)A < (λcut off)B     ⇒    VA > VB .

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