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Popular Questions
- A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal i..
- Broadcasting antennas are generally
- A laser is a coherent source because it contains
- The speed of electromagnetic waves in vacuum depends upon the source of radiation. It
- 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..
- Electromagnetic waves are transverse in nature as is evident by
- Maximum Usable frequency (MUF) in F - region layer is
- The ratio waves of frequency 300MHz to 3000MHz belong to
- during the propagation of electromagnets waves in a medium:
- The process of regaining of information from carrier wave at the receiver is termed as
- For television broadcasting, the frequency employed is normally
- Laser beams are used to measure long distances because
- The characteristic impedance of a coaxial cable is of the order of
- Choose the correct statement
- An example of point to point mode of communication is
- A laser beam is used for carrying out surgery because it
- The waves that are bent down by the ionosphere are
- The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 uH indicator is
- Amplitude modulation has
- Which of the following shows greenhouse effect?
- The wavelength of x-rays is of the order of
- an antenna behaves as resonant circuit only when its length is
- Consider telecommunication through optical fibres. which of the following
- The electromagnetic waves of frequency 2 MHz to 30mhz are used
- this question has statement 1, and statement 2. of the four choice, given the statement
- a real LED emits light at 0.1 watt uniformly around it. the amplitude
- A laser beam of pulse power
- AM is used for broadcasting because
- In which frequency range, space waves are normally propagated
- The attenuation in optical fiber is mainly due to
- A point source of electromagnetic radiation has an average power output of 1500 W. The maximum value of electric field at a distan..
- Through which mode of propagation, the radio waves can be sent from one place to another
- 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 is absorbed by the ozone layer?
- A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a cert..
- A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a cert..
- A plane electromagnetic wave of frequency 20 MHz travels through a space along x-direction. If the electric field vector at a cert..
- The displacement current was first postulated by
- Solar radiation is
- Electromagnetic waves can be deflected by
