Question
What will be the energy of one photon of radiation whose frequency is $$5 \times {10^{14}}\,Hz?$$
A.
$$199.51\,kJ$$
B.
$$3.3 \times {10^{ - 19}}\,J$$
C.
$$6.626 \times {10^{ - 34}}\,J$$
D.
$$2.31 \times {10^5}\,J$$
Answer :
$$3.3 \times {10^{ - 19}}\,J$$
Solution :
Energy of one photon is given by the expression,
$$\eqalign{
& E = h\upsilon \cr
& E = 6.626 \times {10^{ - 34}}J\,\,s \times 5 \times {10^{14}}{s^{ - 1}} \cr
& \,\,\,\,\,\, = 3.313 \times {10^{ - 19}}J \cr} $$