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 is the longest wave?
X-rays
Y-rays
Microwaves
Radiowaves
Which one of the following electromagnetic radiations have the smallest wavelength?
Ultraviolet waves
What is the wave length of a television station which transmits vision on 500 MHz?
0.5 m
0.6 m
0.06 m
60 m
The structure of solids is investigated by using
Cosmic rays
Radio waves
Infrared radiations
In a plane electromagnetic wave, the electric field oscillates with a frequency of 2 × 1010 s-1 and an amplitude of 40 Vm-1. The wavelength of the wave is
3 × 10-3 m
2.5 × 10-2 m
1.5 × 10-2 m
4.5 × 10-3 m
All components of the electromagnetic spectrum in vacuum have the same
energy
velocity
wavelength
frequency
The waves which cannot travel in vacuum are
x-rays
radio waves
infrasonic waves
ultraviolet rays
Mapping of the radio emissions from extra-terrestrial sources is known as ________________.
Radiography
Radio-astronomy
Seiesmography
None of these
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
