- Wavelepgth.
- Frequency.
- Velocity.
- Amplitude.
Explanation:
Frequency of a light wave doesnt change on changing the medium of propagation of light.
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Capacitance of a capacitor made by a thin metal foil is 2μF. If the foil is folded with paper of thickness 0.15 mm, dielectric constant of paper is 2.5 and width of paper is 400 mm , then length of foil will be
|
(a) 0.34 m |
(b) 1.33 m |
(c) 13.4 m |
(d) 33.9 m |
A triangular loop of side l carries a current I. It is placed in a magnetic field B such that the plane of the loop is in the direction of B. The torque on the loop is
|
(a) Zero |
(b) IBl |
(c) |
(d) |
A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency 4 . What will be the frequency observed by an observer on the earth
|
(a) 4 |
(b) 3.2 |
(c) 3 |
(d) 5 |
An air filled parallel plate capacitor has capacity C. If distance between plates is doubled and it is immersed in a liquid then capacity becomes twice. Dielectric constant of the liquid is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
Red light is used as danger signal because it is:
A charged water drop whose radius is 0.1 μm is in equilibrium in an electric field. If charge on it is equal to charge of an electron, then intensity of electric field will be (g = 10
|
(a) 1.61 N/C |
(b) 26.2 N/C |
(c) 262 N/C |
(d) 1610 N/C |