Monochromatic light of wavelength 667 nm is produced by a helium neon laser. The power emitted is 9 mW . The number of photons arriving per second on the average at a target irradiated by this beam is :

1. A. 3 10 19
2. B. 9 10 17
3. C. 3 10 16
4. D. 9 10 15

Attempt this NEET 2009 Physics question free — pick an option to reveal the correct answer and a step-by-step explanation. Then join NEET Mastery Quest to practise 15,000+ PYQ and 2027-syllabus questions.