How are microwaves produced?
- ABy the oscillation of electrons in special vacuum tubes like klystrons, magnetrons, and Gunn diodes.
- BBy the vibration of atoms and molecules.
- CBy the transition of electrons between energy levels in atoms.
- DBy the deceleration of high-speed electrons hitting a metal target.
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Similar Questions
The amplitude of the magnetic field in an electromagnetic wave propagating along the $y$-axis is $6.0 \times 10^{-7} \, T$. The maximum value of the electric field in the electromagnetic wave is:
The ratio of the speeds of electromagnetic waves in a vacuum and in a medium with dielectric constant $K=3$ and permeability $\mu=2\mu_{0}$ is (where $\mu_{0}$ is the permeability of vacuum).
Suppose that the electric field amplitude of an electromagnetic wave is $E_{0}=120 \text{ NC}^{-1}$ and its frequency $f=50 \text{ MHz}$. Then,which of the following values is incorrectly computed?
In vacuum,the speed of light depends upon
Easy
View SolutionThe electric field part of an electromagnetic wave in a medium is represented by $E_x=0, E_y=2.5 \frac{N}{C} \cos \left[ (2\pi \times 10^6 \frac{rad}{s})t - (\pi \times 10^{-2} \frac{rad}{m})x \right]$,and $E_z=0$. The wave is
MediumAIPMT 2009
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