Question

What is the number of photons of light with a wavelength of 4000 pm that provide 1 joule of energy?

Answer 1

Answer:

$The \: wavelength \: of \: light \: is  \: 4000pm or 4000× {10}^{ - 12} m</p><p></p><p>$

$the \: energy \: of \: 1 \: photon = \frac{hc}{λ} </p><p></p><p></p><p>$

$= \frac{6.626 \times {10}^{ - 34 } \times 3 \times { 10 }^{8} }{4 \times {10}^{9} }$

$= 4.97 \times {10}^{ - 17} J$

$the \: no.of \: photons \: that \: will \:p rovide \: 1J\: of \: energy \: is \:$

$\frac{1}{4.97 \times {10}^{ - 17} } = 2.01 \times {10}^{18}$