Which one of the following electromagnetic radiations have the smallest wavelength?
X-rays
Y-rays
Ultraviolet waves
Microwaves
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
Electromagnetic waves are
transverse waves
longitudinal waves
produced by charges moving with constant velocity
none of the above
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
The structure of solids is investigated by using
Cosmic rays
Radio waves
Infrared radiations
The frequency of y-rays, X-rays and ultraviolet rays are a, b and c respectively. Then
a > b > c
a < b < c
a = b = c
a > c > b
What is the cause of "Green house effect"?
Infrared rays
Ultraviolet rays
Radio-waves
The wave length of a radio wave of frequency of 1 MHz is
400 m
300 m
350 m
200 m
Mapping of the radio emissions from extra-terrestrial sources is known as ________________.
Radiography
Radio-astronomy
Seiesmography
None of these
1 Ao =
10-8 cm
10-9 cm
10-10 cm
10-11 cm
