The source of ultraviolet light is
Electric bulb
Red hot iron ball
Sodium vapour lamp
Carbon arc - lamp
The most energetic electromagnetic radiations are
Micro waves
Ultraviolet waves
X - rays
Gamma rays
Which of the following is correct
λ blue > λ yellow > λ green
λ yellow > λ green > λ blue
λ yellow > λblue > λgreen
λgreen > λ blue > λ yellow
The sky at noon appears ___________
Black
Blue
White
Yellow
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 colour of clouds is ___________
The region beyond the violet end of the spectrum is __________
Ultraviolet
Infrared
Microwaves
Which is the high energetic invisible electromagnetic wave which helps in study of structure of crystals?
Infrared rays
_________ are used for photography in fog
X-ray
Radio waves
Infrared radiations
How would earth appear when seen from space?
Red
