- AWavelepgth.
- BFrequency.
- CVelocity.
- DAmplitude.
Explanation:
Frequency of a light wave doesnt change on changing the medium of propagation of light.
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de-Broglie hypothesis treated electrons as
|
(a) Particles |
(b) Waves |
(c) Both ‘a’ and ‘b’ |
(d) None of these |
Which rays are not the portion of electromagnetic spectrum
|
(a) X-rays |
(b) Microwaves |
(c) a-rays |
(d) Radio waves |
The period of oscillations of a magnetic needle in a magnetic field is 1.0 sec. If the length of the needle is halved by cutting it, the time period will be
| (a) 1.0 sec | (b) 0.5 sec | (c) 0.25 sec | (d) 2.0 sec |
In a Ag voltameter 2.68 gm of silver is deposited in 10 min. The heat developed in 20Ω resistor during the same period will be

|
(a) 192 kJ |
(b) 192 J |
(c) 200 J |
(d) 132 kJ |
A hot electric iron has a resistance of 80 Ω and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be
|
(a) 8000 Wh |
(b) 2000 Wh |
(c) 1000 Wh |
(d) 800 Wh |