1.

The photoelectric threshold wavelength of silver is \[3250\times {{10}^{-10}}m.\]The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength \[2536\times {{10}^{-10\,}}\]m is (Given\[h=4.14\times {{10}^{-15}}eV\text{ and }c=3\times {{10}^{8}}m{{s}^{-1}}\])

A. \[=0.6\times {{10}^{6}}m{{s}^{-1}}\]
B. \[=61\times {{10}^{3}}m{{s}^{-1}}\]
C. \[=0.3\times {{10}^{6}}m{{s}^{-1}}\]
D. \[=6\times {{10}^{6}}m{{s}^{-1}}\]
Answer» B. \[=61\times {{10}^{3}}m{{s}^{-1}}\]


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