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  4. The number of photons of light of wavelength 7000 mathringA equivalent to 1 J are

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Q. The number of photons of light of wavelength $7000\, \mathring{A}$ equivalent to $1\, J$ are

Structure of Atom

Solution:

$E =\frac{ nhc }{\lambda}$
$n=\frac{\lambda \times E }{ h \times c }=\frac{7000 \times 10^{-10} m \times 1 J }{6.6 \times 10^{-34} J - s \times 3 \times 10^{8} m / s }$