Which is the high energetic invisible electromagnetic wave which helps in study of structure of crystals?
Gamma rays
X - rays
Microwaves
Infrared rays
The colour of the sky opposite the sun is ____________
White
Yellow
Red
Blue
The most energetic electromagnetic radiations are
Micro waves
Ultraviolet waves
When a white light ray falls on a prism, the ray at its first surface suffers.
No refraction
Only dispersion
Only deviation
Both deviation and dispersion
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
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 colour of white light travels fastest in glass?
Violet
Green
Which colour is used for danger signal?
Black
Dark green
The subjective property of light related to its wavelength is
Speed
Frequency
Colour
None of these
The colour of clouds is ___________
