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11. Dual nature of radiation and matter — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics11. Dual nature of radiation and matter1 Mark
MCQ
The figure shows different graphs between stopping potential $({V_0})$ and frequency $(v)$ for photosensitive surface of cesium, potassium, sodium and lithium. The plots are parallel. Correct ranking of the targets according to their work function greatest first will be
  • A
    $(i) > (ii) > (iii) > (iv)$
  • B
    $(i) > (iii) > (ii) > (iv)$
  • ✓
    $(iv) > (iii) > (ii) > (i)$
  • D
    $(i) = (iii) > (ii) = (iv)$
✓

Answer

Correct option: C.
$(iv) > (iii) > (ii) > (i)$
c
(c)The graph between $V_0$ and $v$ cut the $v$ - axis at $v_0$.
For the given graphs ${({\nu _0})_{(iv)}} > {({\nu _0})_{(iii)}} > {({\nu _0})_{(ii)}} > {({\nu _0})_{(i)}}$

$ \therefore (W_0)_{(iv)} > (W_0)_{(iii)} > (W_0)_{(ii)} > (W_0)_{(i)}$

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