The electromagnetic waves ranging in frequencies between 1 GHz and 300 GHz are called _______
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Plane electromagnetic wave travels in vacuum along z-direction. If the frequency of the wave is 30 MHz, its wavelength is
State the part of the electromagnetic spectrum to which 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift)..Belongs
Long distance radio broadcasts use short-wave bands because
Which of these mechanisms can be used to produce electromagnetic waves?
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B0= 510 nT. Amplitude of the electric field part of the wave is
It is necessary to use satellites for long distance TV transmission because
The intensity of a plane electromagnetic wave is proportional to
The direction of propagation of an electromagnetic plane wave is
Use the formula λm T = 0.29 cmK to obtain the characteristic temperature range for λm=5×10-7m
Optical and radio telescopes are built on the ground, but X-ray Astronomy is possible only from satellites orbiting the earth because
Without the concept of displacement current it is not possible to correctly apply Ampere’s law on a path parallel to the plates of parallel plate capacitor C in
State the part of the electromagnetic spectrum to which 21 cm (wavelength emitted by atomic hydrogen in interstellar space).belongs
Velocity of plane electromagnetic waves in vacuum equals
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. Frequency of the electromagnetic waves produced by the oscillator is
If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?
7.5 MHz to 12 MHz band corresponds to wavelength band of
The speed of plane electromagnetic waves is maximum in
When white light is split into its component colors by a prism
Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?
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