1 Ao =
10-8 cm
10-9 cm
10-10 cm
10-11 cm
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 one of the following electromagnetic radiations have the smallest wavelength?
X-rays
Y-rays
Ultraviolet waves
Microwaves
What is the cause of "Green house effect"?
Infrared rays
Ultraviolet rays
Radio-waves
Which of the following is the longest wave?
Radiowaves
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 wave length of a radio wave of frequency of 1 MHz is
400 m
300 m
350 m
200 m
The waves which cannot travel in vacuum are
x-rays
radio waves
infrasonic waves
ultraviolet rays
________are produced by the electromagnetic oscillators of low frequency.
UV radiations
Infrared radiations
Radio waves
