A radiation x is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation x is ___________
Infrared radiation
Visible light
Ultraviolet radiation
X-rays
The range of wavelength of the electromagnetic waves visible to us is ____________
4000 Ao to 8000 Ao
2000Ao to 4000Ao
100Ao to 4000Ao
0.1Ao to 100Ao
Which of the following are not the factors on which the deviation produced by a prism depends ?
The angle of incidence at the first surface
The angle of prism
The angle of refraction at second surface
The refractive index of the material of the prism
At the time of sunrise and sunset, the sun appears ___________
Blue
Red
Yellow
White
The colour of the sky opposite the sun is ____________
The region beyond the violet end of the spectrum is __________
Ultraviolet
Infrared
Microwaves
Which colour of white light travels fastest in glass?
Violet
Green
The photographic dark rooms are provided with _________ lamps
Microwave
None of these
The most energetic electromagnetic radiations are
Micro waves
Ultraviolet waves
X - rays
Gamma rays
In glass, when wavelength of light increases then speed of light _________
Decreases
Increases
Remains constant
