Y₁ Microwaves
Microwave oven, Aircraft Navigator or any other
Y₂ Ultraviolet waves
Sterilize surgical instruments, food preservation or any other

Source: Infrared waves are produced by hot objects and vibration of atoms and molecules.
Uses:
(i) In remote control of TV, VCR, etc.
(ii) In photography in thin mist.

An oscillating charge is considered as the accelerating charge. This produces an oscillating electric field in space, which produces an oscillating magnetic field, that in turn again produces oscillating electric field. These oscillating and magnetic electric field, hence keep on regenerating each other and an electromagnetic wave.
The is produced. frequency of EM wave = frequency charge

\(\lambda =\frac { c }{ v } =\frac { 3\times { 10 }^{ 8 } }{ 5\times { 10 }^{ 19 } } =6\times { 10 }^{ -12 }m=0.06\overset { o }{ A } \)
This wavelength corresponds to X-rays wchich are used:
(i) as a diagnostic tool                         
(ii) as s treatmenrt for certain forms of cancer.

(i) Microwaves are produced by special vacuum tubes like the klystron, / Magnetron / Gunn diode.
The frequency of microwaves is selected to match the resonant frequency of water molecules, so that energy is transferred efficiently to the kinetic energy of the molecules.
(ii) (a) Associated with the green house effect.
(b) In remote switches of household electrical appliances.

The direction of propagation of the electromagnetic wave is perpendicular to both electric field vector E and magnetic field vector B, i.e. In the direction of E x B.
This can be seen by the diagram given below.

Here, electromagnetic wave is along the Z-direction which is given by the cross product of E and B

An electric charge at rest has an electric field in the region around it, but no magnetic field. A moving charge, however, produces both electric and magnetic fields. If the charge is moving with constant velocity (that is, the current is not changing with time), the fields will not change with time and no electromagnetic wave can be produced. If, however, the motion of the charge is accelerated, the electric and the magnetic fields will change with space and time; then it produces electromagnetic waves. Hence we conclude that an accelerated charge emits electromagnetic waves.
In an oscillatory L-C circuit, charge oscillates across the capacitor plates. An oscillating charge has a non-zero acceleration; hence it emits electromagnetic wave of frequency same as that of the oscillating charge.
Shows the graphical representation of an electromagnetic wave in which the electric field.
vector \(\vec { E } \) and the magnetic field vector \(\vec { B } \) are vibrating along Y and X-directions respectively, and the wave is propagating along Z-direction. Both E and B vary with time and space and have the same frequency.

\(\frac { { E }^{ 0 } }{ { B }^{ 0 } } =c\)

Yes, the ammeter will show the momentary deflection.
This momentary deflection occurs due to the fact that the conducting current flows through connecting wires during the charging of capacitor. This leads to deposition of charge at two plates and hence, varying electric field of increasing nature is produced between the plates which in turn produces displacement current in space between two plates, which maintains the continuity with the conduction current.
\({ I }_{ c }={ I }_{ d }\)
i.e Current inside the capacitor=Displacement current Where,
\({ I }_{ d }=\varepsilon _{ 0 }\frac { d\phi _{ E } }{ dt }\)

Let the alternating emf charging the plates of capacitor be V = V₀ sin \(\omega\)t ....(i)
Charge on the capacitor,
q = CV = CV₀ sin \(\omega\)t        [from Eq.(i)]
and instantaneous current, \(I=\frac{d q}{d t}=\frac{d}{d t}\left(C V_0 \sin \omega t\right)\)
\(=\omega C V_0 \cos \omega t=I_0 \cos \omega t\)
where, \(I_0=\omega C V_0\)
Displacement current, \(I_d=\varepsilon_0 \frac{d \phi_E}{d t}\)
\(\begin{aligned} \Rightarrow \varepsilon_0 A \frac{d(E)}{d t} & =\varepsilon_0 A \frac{d}{d t}\left(\frac{q}{\varepsilon_0 A}\right)=\varepsilon_0 A \frac{d}{d t}\left(\frac{C V_0 \sin \omega t}{\varepsilon_0 A}\right) \end{aligned}\)
\(\begin{aligned} =\frac{d}{d t}\left(C V_0 \sin \omega t\right) \end{aligned}\)
\(\begin{aligned} =\omega C V_0 \cos \omega t=I_0 \cos \omega t \end{aligned}\)
Thus, the displacement current inside the capacitor is the same as the current charging the capacitor.

(i) Given that velocity, v = \(\upsilon \overset { \wedge }{ i } \) , i.e. the wave is propagating along X-axis so electric field E is along Y-axis and magnetic field B is along Z-axis. The
propagation of electromagnetic wave is shown in the figure.

(ii) Speed of electromagnetic wave can be given as
 \(c=\frac { { E }_{ 0 } }{ { B }_{ 0 } } =\frac { E }{ B } \)
where, E₀ and B₀ are peak values of E and B or instantaneous values of E and B.

The wavelength of electromagnetic waves ranges from.\(6\times { 10 }^{ -14 }m \ to \ 6\times { 10 }^{ 6 }m\) These waves travel at the same velocity in a\((=3\times { 10 }^{ 8 }{ ms }^{ -1 })\) vacuum but with different velocity in a medium. In fact, the velocity of an electromagnetic wave is less in a medium than vacuum and a medium provides different values of refractive index to the electromagnetic waves of different wavelengths.

Intensity of light is reduced to one fourth because the light beam spreads as it approaches into a spherical region of area \(4\pi { r }^{ 2 },i.e.,I\infty 1/{ r }^{ 2 }\) But laser beam does not spread, hence its intensity remains constant. Laser beam is unidirectional, monochromatic and coherent light, whereas the light from a bulb does not posses the above properties.