NTA Abhyas JEE Main2020PhysicsDual Nature of MatterPractice
The de-Broglie wavelength of a ball of mass 120 g moving at a speed of 20 m s - 1 is (Planck's constant h = 6 . 6 × 10 - 34 J s )
Options
- A3 . 5 × 10 - 34 m
- B2.8 × 10 - 34 m
- C1.2 × 10 - 34 m
- D2.1 × 10 - 34 m
Correct answer
B. 2.8 × 10 - 34 m
Step-by-step solution
de-Broglie wavelength, λ = h m v = 6.6 × 10 - 34 120 × 10 - 3 × 20 = 2 . 75 × 10 - 34 m