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प्रश्न
What is the ratio of the speed of gamma rays to that of radio waves in a vacuum?
उत्तर
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संबंधित प्रश्न
Suppose that the electric field part of an electromagnetic wave in vacuum is
`vec"E" = {(3.1"N"/"C") cos[(1.8 ("rad")/"m")"y" + (5.4 xx 10^8 ("rad")/"s")"t"]}hat"i"`
(a) What is the direction of propagation?
(b) What is the wavelength λ?
(c) What is the frequency v?
(d) What is the amplitude of the magnetic field part of the wave?
(e) Write an expression for the magnetic field part of the wave.
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.
Consider the situation of the previous problem. Define displacement resistance Rd = V/idof the space between the plates, where V is the potential difference between the plates and id is the displacement current. Show that Rd varies with time as `R_d = R(e^(t"/"tau) - 1)` .
How are electromagnetic waves produced? What is the source of the energy carried by a propagating electromagnetic wave?
Identify the electromagnetic radiations used
(i) In remote switches of a household electronic device; and
(ii) as a diagnostic tool in medicine
The dimension of `1/(mu_0 ∈_0)` is
Which of the following is NOT true for electromagnetic waves?
The electric and magnetic fields of an electromagnetic wave are ______.
Magnitude of the electric and the magnetic fields in a plane electromagnetic wave are related by ______.
The velocity of light in vacuum can be changed by changing
An electromagnetic wave is produced by a charge ______.
