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
The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by
Which one of the following electromagnetic radiations have the smallest wavelength?
X-rays
y-rays
Ultraviolet waves
Microwaves
Which of the following has minimum wavelength?
Ultraviolet rays
Cosmic rays
Electromagnetic waves are
transverse waves
longitudinal waves
produced by charges moving with constant velocity
none of the above
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
40.5 m
42.3 m
36.6 m
50.9 m
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
cosmic rays
sky wave
sea wave
both (a) and (b)
In a certain region of space electric file and magnetic field are perpendicular to each other and an electron enters in region perpendicular to the direction of and both and moves undeflected, then velocity of electron is
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
Which of the following rays are not electromagnetic waves?
β-rays
Heat rays
