Question 49
Modern PhysicsThe energy of a photon having a wavelength of 10−10m is (h = 6.63 × 10−34Js c = 3.0 × 108ms−1)
- A.2.0 × 10−15J.
- B.1.7 × 10−13J.
- C.2.0 × 10−12J.
- D.1.7 × 10−12J.
Show the answer and explanation
Answer: A (2.0 × 10−15J.)
Explanation
E = hc/λ = 6.63 × 10−34 × 3.0 × 108 ÷ 10−10 ≈ 2.0 × 10−15 J.