Question

energy of an emr of wavelength the 1.5 μm is...
a-1.6565×10-21j
b-2.4847×10-21 j
c-4.4195×10-21 j
d-1.3252×10-21 j​

Answer 1

Answer:

the numbers are solo confusing

Answer 2

Given:

Wavelength ( $\lambda$ $= 1.5um$ )

To find:

Energy

Solution:

Option (d) is correct

Energy of light (or photon energy), E, is inversely proportional to the wavelength and is given by the equation:

$E = \frac{hc}{\lambda}$

where h is Planck's constant ($6.67 \times 10^-^{34}$ J s) and c is the speed of light

$3\times10^8 m/s$.  

   $E = \frac{6.67 \times 10^-^{34} \times 3\times 10^8}{1.5\times 10^-^6}$

        $= 13.34 \times 10^{-20} J$  $= 1.3252\times 10^{-21}} J$

Therefore option (d) is correct.