MCQ
Which two physical quantities have same units?
- AWork function and threshold frequency
- ✓Planck's constant and angular momentum
- CWork function and stopping potential
- DPlanck's constant and angular velocity
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An electron (mass = 9 × 10–31kg. Charge = 1.6 × 10–19C) whose kinetic energy is 7.2 × 10–18 joule is moving in a circular orbit in a magnetic field of 9 × 10–5 weber/m2. The radius of the orbit is
|
(a) 1.25 cm |
(b) 2.5 cm |
(c) 12.5 cm |
(d) 25.0 cm |