- 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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The tangent galvanometer, when connected in series with a standard resistance can be used as
|
(a) An ammeter |
(b) A voltmeter |
|
(c) A wattmeter |
(d) Both an ammeter and a voltmeter |
An electron (charge = 1.6
coulomb) is accelerated through a potential of 1,00,000 volts. The energy required by the electron is
|
(a) 1.6 |
(b) 1.6 |
(c) 0.53 |
(d) 1.6 |
Average energy stored in a pure inductance L when a current i flows through it, is
|
(a) |
(b) |
(c) |
(d) |
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is
| (a) 180 cm | (b) 90 cm | (c) 85 cm | (d) 170 cm |
At noon the sun appears white because: