A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal i..
The characteristic impedance of a coaxial cable is of the order of
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The step index fiber has a relative refractive index of 0.88% . What is the critical angle at the corecladding interface
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The attenuation in optical fiber is mainly due to
Laser beams are used to measure long distances because
an antenna behaves as resonant circuit only when its length is
A laser is a coherent source because it contains
For television broadcasting, the frequency employed is normally
Choose the correct statement
A laser beam of pulse power
Maximum Usable frequency (MUF) in F - region layer is
The waves that are bent down by the ionosphere are
The ratio waves of frequency 300MHz to 3000MHz belong to
A laser beam is used for carrying out surgery because it
Rank the following radiations according to their associated energies, greatest first.
I. Yellow light from a sodium lamp.
An example of point to point mode of communication is
In which frequency range, space waves are normally propagated
The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 uH indicator is
An electromagnetic radiation has an energy of 13.2 keV. Then, the radiation belongs to the region of
Amplitude modulation has
The electromagnetic waves of frequency 2 MHz to 30mhz are used
An expression for the magnetic field strength B at the point between the capacitor plates indicates in Fig. Express B in terms of ..
If u1 and u2 are the refractive indices of the material of core and cladding of an optical fibre, then the loss of light due to i..
AM is used for broadcasting because
Maxwellâ€™s modified form of Ampereâ€™s circuital law is
The process of regaining of information from carrier wave at the receiver is termed as
Through which mode of propagation, the radio waves can be sent from one place to another
A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum p and energy E, then
The speed of electromagnetic waves in vacuum depends upon the source of radiation. It
The wavelength of x-rays is of the order of
A point source of electromagnetic radiation has an average power output of 1500 W. The maximum value of electric field at a distan..
Solar radiation is
A charged particle oscillates about its mean equilibrium position with a frequency of 10^9 Hz. Frequency of the electromagnetic wa..
Which of the following shows greenhouse effect?
Electromagnetic waves can be deflected by
Which of the following is absorbed by the ozone layer?
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