- ARadio Waves
- BGamma Waves
- CX-Rays
- DInfrared Waves
Explanation:
Infrared waves are heat radiations also known as heatwaves. These waves are produced by hot bodies and molecules. They do heating because water molecules present in most of the materials readily absorb infrared waves and their thermal motion increases, so they heat themselves and also heat their surroundings.
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At ordinary temperatures, the electrical conductivity of semi conductors in mho/meter is in the range
|
(a) |
(b) |
(c) |
(d) |
What will be the colour of sky as seen from the earth, if there were no atmosphere
|
(a) Black |
(b) Blue |
(c) Orange |
(d) Red |
For the Bohr's first orbit of circumference 2πr, the de-Broglie wavelength of revolving electron will be
|
(a) 2πr |
(b) πr |
(c) |
(d) |
The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of 2 Ω is connected as a shunt with the cell, the balance point is obtained at 100 cm. The internal resistance of the cell is
|
(a) 0.1 Ω |
(b) 1 Ω |
(c) 2 Ω |
(d) 0.5 Ω |