Question

The energy of light of wavelength 45 nm is 

(a) 6.67 x 10¹⁵ J 

(b) 6.67 x 10¹¹ J 

(c) 4.42 x 10¹⁸ J 

(d) 4.42 x 10^-15 J

Answer 1

(c) 4.42 x 10¹⁸ J 

E = hv = hc / λ

= 4.42 x 10¹⁸ J