1.

Mercury violet light \[(\lambda =4558{AA})\] is falling on a photosensitive material \[(\varphi =2.5eV)\]. The speed of the ejected electrons is in \[m{{s}^{-1}}\], about                         [AMU (Engg.) 1999]

A. \[3\times {{10}^{5}}\]      
B. \[{{K}_{A}}={{K}_{B}}/2\]
C. \[4\times {{10}^{4}}\]      
D. \[3.65\times {{10}^{7}}\]
Answer» C. \[4\times {{10}^{4}}\]      


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