Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10–3 W.  How many photons per second, on an average, are emitted by the source?

5.0 ×1015 5.50 ×1013 10.0 ×1012 5.50 ×1015

5.0 ×1015

Use : E=hv P=NE = Nhv