QUIZ 3-ELECTROMAGNETIC WAVES-XII

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1. Name the part of the electromagnetic spectrum having frequency 5x10¹¹ Hz belongs

Radio wave

visible light

Microwave

infra Red

2. A plane electromagnetic wave travels, in vacuum, along the y-direction. The directions of its electric and magnetic field vectors

Ex,Bz

Ey,Bx

Ez,Bx

Ex,By

3. The charging current for a capacitor is 0.25 A. What is the displacement current across its plates ?

>0.25A

0.25A

<0.25A

4. The relation between speed (c) , frequency (v) and wavelength(\(\lambda\))

\(c=v /\lambda\)

\(c=v\lambda\)

\(c= {\lambda\over v}\)

none of the above

5. Which of the following waves can be polarized and reason also.

Heat wave because it is transverse wave

heat wave because it is a longitudinal wave

sound wave because it is transverse wave

sound wave because it is a longitudinal wave

6. Calculate the wavelength of em wave having frequency 3 x 10¹³ Hz

10⁶Hz

10^-5Hz

10^-6Hz

10⁵ Hz

7. A Plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time. E = 6.3 V/m. What is B at this point

2.1 x 10^-8T

2.1 x 10⁺⁷T

2.1 x 10⁺⁸T

2.1 x 10^-7T

8. speed of an em wave in a medium is given by

\(v={c\mu o\over\epsilon0}\)

\(v={c\over{\sqrt{\mu0\epsilon0}}}\)

\(v={c\epsilon 0\over\mu o}\)

\(v={c\over\mu0\epsilon0}\)

9. speed of em wave in vacuum is given by

\(c={1\over\mu 0 \epsilon 0}\)

\(c={\mu0\over\epsilon0}\)

\(c={\epsilon0\over\mu0}\)

\(c={1\over\sqrt{\mu0\epsilon0}}\)

10. A charge particle oscillates about its mean equilibrium position with a frequency of 10⁹ Hz. What is the frequency of the electromagnetic wave produced by the oscillator?

=10^-9Hz

<10⁹ Hz

=10⁹ Hz

>10⁹ Hz

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