Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck's constant h = 6.63 x 10-34 Js;

speed of light c = 3 x 108 ms -1)

  • Option 1)

    6.67 x 1015

  • Option 2)

    6.67 x 1011

  • Option 3)

    4.42 x 10-15

  • Option 4)

    4.42 x 10-18

 

Answers (1)

@9637

E=\frac{hc}{\lambda }

\lambda =45nm=45\times 10^{-9}m

h=6.62\times 10^{-34} \: J-S, \: C=3\times 10^{8}m/s

\therefore E=\frac{6062\times 10^{-34}\times 3\times 10^{8}}{45\times 10^{-9}}

=4.42\times 10^{-18} J

 

 


Option 1)

6.67 x 1015

This is incorrect opion

Option 2)

6.67 x 1011

This is incorrect opion

Option 3)

4.42 x 10-15

This is incorrect opion

Option 4)

4.42 x 10-18

This is correct opion

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