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
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
Sky wave
Ground wave
Sea Wave
Both (a) and (b)
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
A TV tower has a height of 100 m. How much population is covered by the TV broadcast if the average population density around the tower is 1000 km-2 (radius of earth = 6370 km)?
4,00,000
4,000
40,000
40,000,00
The structure of solids is investigated by using
Cosmic rays
X-rays
Y-rays
Infrared radiation
Which of the following rays are not electromagnetic waves?
β-rays
Heat rays
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 has minimum wavelength?
Ultraviolet rays
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?
