Answer:
2.99 x 10^14 Hz
Step-by-step explanation:
E photon= hf (you have to solve for f)
f= E photon/h
f= 1.98 x 10^-19 J / 6.63 x 10^-34 J x s
f=2.99 x 10^14 Hz
2.00x 10 14th Hz
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