Question 43
Modern PhysicsIf the threshold frequency for tungsten is 1.3 × 1015 Hz, what is its work function? [h = 6.6 × 10−34 Js]
- A.8.58 × 10−17J
- B.8.85 × 10−18J
- C.8.58 × 10−19J
- D.8.58 × 10−15J
Show the answer and explanation
Answer: C (8.58 × 10−19J)
Explanation
Work function W = hf0 = 6.6 × 10−34 × 1.3 × 1015 = 8.58 × 10−19 J.