📅 NSB 2015🎓 HS🔄 Round 1#️⃣ Q23❓ TOSS-UP✍️ Short Answer
A 100 milliwatt laser delivers 2.50 × 10^17 photons per second. Expressing your answer in scientific notation with one significant figure, how much energy in joules does each photon deliver?
✔️Answer:4 × 10^-19
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