________are produced by the electromagnetic oscillators of low frequency.
UV radiations
Infrared radiations
Microwaves
Radio waves
Ozone layer blocks the radiations of wave length
less than 3 × 10-7 m
equal to 3 × 10-7 m
more than 3 × 10-7 m
all of the above
Which of the following rays are not electromagnetic waves?
β-rays
Heat rays
X-rays
Y-rays
Mapping of the radio emissions from extra-terrestrial sources is known as ________________.
Radiography
Radio-astronomy
Seiesmography
None of these
The most energetic electromagnetic radiations are
microwaves
ultraviolet rays
x-rays
gamma rays
The frequency of electromagnetic wave, which is best suited to observe a particle of radius 3 × 10-4 cm, is of the order of
1015
1014
1013
1012
Which of the following is the longest wave?
Radiowaves
The wave length of the UV radiations range about
0.4 µm to 0.7 µm
10 µm to 10 m
0.4 µm to 1 nm
1 m to 100 km
All components of the electromagnetic spectrum in vacuum have the same
energy
velocity
wavelength
frequency
Which one of the following electromagnetic radiations have the smallest wavelength?
Ultraviolet waves
