Question 48
Modern PhysicsAn electron makes a transition from a certain energy level EK to the ground state E0. If the frequency of emission is 8.0 × 1014 Hz, the energy emitted is [h = 6.6 × 10−34Js]
- A.8.25 × 10−19J
- B.5.28 × 10−19J
- C.5.28 × 1019J
- D.8.25 × 1019J
Show the answer and explanation
Answer: B (5.28 × 10−19J)
Explanation
E = hf = 6.6 × 10−34 × 8.0 × 1014 = 5.28 × 10−19 J.