Advertisements
Advertisements
प्रश्न
Define frequency modulation and state any one advantage of frequency modulation (FM) over amplitude modulation (AM).
उत्तर
When the frequency of carrier wave is varies in accordance with the information signal, the corresponding modulation is called frequency modulation.
The advantages of frequency modulation (FM) over amplitude modulation (AM) is that FM is less prone to interference than AM.
APPEARS IN
संबंधित प्रश्न
In the study of a photoelectric effect the graph between the stopping potential V and frequency v of the incident radiation on two different metals P and Q is shown below:
(i) Which one of the two metals has higher threshold frequency?
(ii) Determine the work function of the metal which has greater value.
(iii) Find the maximum kinetic energy of electron emitted by light of frequency 8 × 1014 Hz for this metal.
A plane electromagnetic wave is passing through a region. Consider (a) electric field (b) magnetic field (c) electrical energy in a small volume and (d) magnetic energy in a small volume. Construct the pairs of the quantities that oscillate with equal frequencies.
Give two uses of UV radiation.
Consider a parallel plate capacitor whose plates are closely spaced. Let R be the radius of the plates and the current in the wire connected to the plates is 5 A, calculate the displacement current through the surface passing between the plates by directly calculating the rate of change of flux of electric field through the surface.
Which of the following are not electromagnetic waves?
For which frequency of light, the eye is most sensitive?
An EM wave radiates outwards from a dipole antenna, with E0 as the amplitude of its electric field vector. The electric field E0 which transports significant energy from the source falls off as ______.
A plane EM wave travelling in vacuum along z direction is given by `E = E_0 sin(kz - ωt)hati` and `B = B_0 sin(kz - ωt)hatj`
- Evaluate `oint E.dl` over the rectangular loop 1234 shown in figure.
- Evaluate `int B.ds` over the surface bounded by loop 1234.
- Use equation `oint E.dl = (-dphi_B)/(dt)` to prove `E_0/B_0` = c.
- By using similar process and the equation `ointB.dl = mu_0I + ε_0 (dphi_E)/(dt)`, prove that c = `1/sqrt(mu_0ε_0)`
A plane electromagnetic wave travels in free space along the x-direction. The electric field component of the wave at a particular point of space and time is E = 6 Vm-1 along the y-direction. Its corresponding magnetic field component, B would be ______.
Write the two characteristics of electromagnetic waves.