Which of the following is the longest wave?
x-rays
y-rays
Microwaves
Radiowaves
If λv, λx and λm represent the wavelengths of visible light, X-rays and microwaves respectively, then
λm > λx > λv
λv > λm > λx
λm > λv > λx
λv > λx > λm
The structure of solids is investigated by using
Cosmic rays
X-rays
Y-rays
Infrared radiation
Which of the following has minimum wavelength?
Ultraviolet rays
The charging current for a capacitor at any instant is 0.25 A.The displacement current across the capacitor plates at that instant is
0.5 A
0.25 A
1 A
2.5 A
If a source is transmitting electromagnetic waves of frequency 8.2 × 106 Hz, then wavelength of the electromagnetic waves transmitted from the source will be
40.5m
42.3m
36.6m
50.9m
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
None of these
Which of the following rays are not electromagnetic waves?
β-rays
Heat rays
The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by
The frequency of y-rays, X-rays and ultraviolet rays are a, b and c respectively. Then
a>b>c
a
a=b-c
a>c>b
