The colour of the sky opposite the sun is ____________
White
Yellow
Red
Blue
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
The most energetic electromagnetic radiations are
Micro waves
Ultraviolet waves
X - rays
Gamma rays
When sunlight enters the earth's atmosphere which colour of light is scattered the most?
Violet
Green
The region beyond the violet end of the spectrum is __________
Ultraviolet
Infrared
Microwaves
X-rays
Which colour of white light travels fastest in glass?
When sunlight enters the earth's atmosphere which colour of light is scattered the least?
Red light
Blue light
Green light
Violet light
The frequency range of visible part of electromagnetic spectrum is
4000 - 8000 Hz
3.75 × 1014 - 7.5 × 1014 Hz
400 - 800 MHz
4 - 8 MHz
Which colour is used for danger signal?
Black
Dark green
In white light of sun, maximum scattering by the air molecules present in the earth's atmosphere for
Red colour
Yellow colour
Green colour
Blue colour