1.

The energy of a photon of light of wavelength 450 nm is [BHU 1997; JIPMER 2000]

A.            \[4.4\times {{10}^{-19}}J\]     
B.            \[2.5\times {{10}^{-19}}J\]
C.            \[1.25\times {{10}^{-17}}J\]  
D.            \[2.5\times {{10}^{-17}}J\]
Answer» B.            \[2.5\times {{10}^{-19}}J\]


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