- AAll particles in it have same phase.
- BFew particles are in same phase, rest are in opposite phase.
- CAll particles have opposite phase of vibrations.
- DAll particles have random vibrations.
Explanation:
It is the imaginary surface representing corresponding points pf a wave that vibrate in unison. When identical waves having a common origin travel through a homogeneous medium, the corresponding crests and troughs at any instant phase.
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A hole in a P-type semiconductor is
| (a) An excess electron | (b) A missing electron |
|
(c) A missing atom |
(d) A donor level |
Curie is a unit of
|
(a) Length |
(b) It is not any unit |
(c) Activity |
(d) Atomic number |
Assertion : In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Reason : As resistance increases current through the circuit increases.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
When cathode rays strike a metal target of high melting point with very high velocity, then
| (a) X-rays are produced | (b) Ealpha-rays are produced |
| (c) TV waves are produced |
(d) Ultrasonic waves are produced |
When light wave suffers reflection at the interface from air to glass, the change in phase of the reflected wave is equal to
| (a) 0 |
(b) |
(c) |
(d) 2 |
The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are
|
(a) 240 V, 5 A |
(b) 240 V, 10 A |
(c) 60 V, 20 A |
(d) 120 V, 20 A |
A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is 5.0 m wide, the intensity of the electric field in this region is
|
(a) 1.0 |
(b) 1.0 |
(c) 2.0 |
(d) 2.0 |