NEET UG PHYSICS MCQ: ELECTROMAGNETIC WAVES

1 Medium

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Application +4 | -1

Electric field in a plane electromagnetic wave is given by

E = 50\sin \,(500x - 10 \times {10^{10}}t)\,v/m.

The velocity of electromagnetic wave in this medium is
(Given,

c

= speed of light in vacuum)

View answer and explanation

Correct option: C

\frac{2}{3}\,\mathrm{c}

Option C (

\frac{2}{3}\,\mathrm{c}

) is correct because the velocity of an electromagnetic wave is given by

\frac{\omega}{k}

, where

\omega

is the angular frequency and

k

is the wave number.

More Questions from ELECTROMAGNETIC WAVES

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{E_X}

{E_R}

{E_M}

60\,\,\frac{V}{m}

{E_1} = {E_{01}}\hat x\cos \left[ {2\pi v\left( {\frac{z}{c} - t} \right)} \right]

{E_2} = {E_{02}}\hat x\cos \left[ {k\left( {2z - ct} \right)} \right]

{\varepsilon _{{r_1}}}

{\varepsilon _{{r_2}}}

\mathrm{\varepsilon }

\mathrm{\mu }

\sqrt {\frac{\mathrm{\mu }}{\mathrm{\varepsilon }}}

y -

\overrightarrow B = 8.0 \times {10^{ - 8}}\widehat zT

= 3 \times {10^8}m{s^{ - 1}}

\widehat x,\widehat {\,y},\widehat {\,z}

x,\,y

z