MCQ
The angular frequency of emf wave will be (in $\frac{\text{rad}}{\text{s}}$)
- A8p × 107
- B4p × 106
- C2p × 105
- D$\pi$ × 104
Explanation:
Frequency of wave f = 40 × 106 Hz
Angular frequency, $\omega=2\pi\text{v}$
$\omega=2\pi\times40\times10^6$
$\Rightarrow\omega=8\pi\times10^7\frac{\text{rad}}{\text{s}}$
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A narrow beam of white light goes through a slab having parallel faces.
Fast neutrons can easily be slowed down by
|
(a) The use of lead shielding |
(b) Passing them through water |
|
(c) Elastic collisions with heavy nuclei |
(d) Applying a strong electric field |