- 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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How should people wearing spectacles work with a microscope
|
(a) They cannot use the microscope at all |
(b) They should keep on wearing their spectacles |
|
(c) They should take off spectacles |
(d) (b) and (c) is both way |
1A current flows through an infinitely long straight wire. The magnetic field produced at a point 1 metres away from it is
|
(a) 2 |
(b) |
(c) 2 |
(d) 2π |
The sun revolves around the galaxy with a speed of 250 km/sec and it's radius is 3 × 104 light year. The mass of the milky way is
|
(a) 3 × 1040 kg |
(b) 3 × 1041 kg |
(c) 5 × 1040 kg |
(d) 6 × 1041 kg |
The phenomena of total internal reflection is seen when angle of incidence is
|
(a) 90° |
(b) Greater than critical angle |
|
(c) Equal to critical angle |
(d) 0° |
Focal length of a convex lens will be maximum for
|
(a) Blue light |
(b) Yellow light |
(c) Green light |
(d) Red light |
A proton of mass 1.67
and charge 1.6
is projected with a speed of 2
m/s at an angle of 60° to the X - axis. If a uniform magnetic field of 0.104 Tesla is applied along Y - axis, the path of proton is
|
(a) A circle of radius = 0.2 m and time period |
|
(b) A circle of radius = 0.1 m and time period 2 |
|
(c) A helix of radius = 0.1 m and time period 2 |
|
(d) A helix of radius = 0.2 m and time period 4 |
Assertion : Dielectric breakdown occurs under the influence of an intense light beam.
Reason : Electromagnetic radiations exert pressure.
|
(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. |
The wavelength of sodium light in air is 5890 Å. The velocity of light in air is 3 The wavelength of light in a glass of refractive index 1.6 would be close to
|
(a) 5890 Å |
(b) 3681 Å |
(c) 9424 Å |
(d) 15078 Å |