QUIZ 3-ELECTROMAGNETIC WAVES-XII

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

\(c=v /\lambda\)

\(c=v\lambda\)

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

none of the above

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

10^-6Hz

10^-5Hz

10⁶Hz

10⁵ Hz

3. 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

4. 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?

=10⁹ Hz

<10⁹ Hz

=10^-9Hz

>10⁹ Hz

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

Ez,Bx

Ey,Bx

Ex,Bz

Ex,By

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

Microwave

visible light

Radio wave

infra Red

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

sound wave because it is transverse wave

heat wave because it is a longitudinal wave

Heat wave because it is transverse wave

sound wave because it is a longitudinal wave

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

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

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

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

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

9. speed of em wave in vacuum is given by

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

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

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

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

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

<0.25A

0.25A

>0.25A

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