- AInfrared waves
- BGamma rays
- CMicrowaves
- DRadio waves
Explanation:
Gamma rays have a maximum frequency.
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Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m. The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90o. A, B and C are three distant points of observation equidistant from the mid-point of PQ. The intensity of radiations at A, B, C will bear the ratio

|
(a) 0 : 1 : 4 |
(b) 4 : 1 : 0 |
(c) 0 : 1 : 2 |
(d) 2 : 1 : 0 |

An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200-volt supply. The resistance R that must be put in series with the bulb, so that the bulb draws 500 W is
|
(a) 10 Ω |
(b) 20 Ω |
(c) 50 Ω |
(d) 100 Ω |
Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct

|
(a) A |
(b) B |
(c) C |
(d) D |
The frequency of a light ray is 6
. Its frequency when it propagates in a medium of refractive index 1.5, will be
|
(a) 1.67 |
(b) 9.10 |
(c) 6 |
(d) 4 |
A candle placed 25 cm from a lens, forms an image on a screen placed 75 cm on the other end of the lens. The focal length and type of the lens should be
|
(a) + 18.75 cm and convex lens |
(b) – 18.75 cm and concave lens |
|
(c) + 20.25 cm and convex lens |
(d) – 20.25 cm and concave lens |