If the distance between a point source and screen is doubled, then intensity of light on the screen will become
|
(a) Four times |
(b) Double |
(c) Half |
(d) One-fourth |
(d) One-fourth
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The angle which subtends the periphery of the spherical mirror at the centre of curvature is called:
A lamp emits monochromatic green light uniformly in all directions. The lamp is 3% efficient in converting electrical power to electromagnetic waves and consumes 100W of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of 10m from the lamp will be
|
(a) 1.34 V/m |
(b) 2.68 V/m |
(c) 5.36 V/m |
(d) 9.37 V/m |
For the circuit shown, which of the following statements is true
|
(a) With |
|
(b) With |
|
(c) With |
|
(d) With |
The activity of a sample of a radioactive material is A, at time 
and 
at time 
. If its mean life T, then
|
(a) |
(d) |
(c) |
(d) |
A moving coil galvanometer has a resistance of 50 Ω and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A
|
(a) 50/99 Ω in series |
(b) 50/99 Ω in parallel |
|
(c) 0.01 Ω in series |
(d) 0.01 Ω in parallel |
