If the amplitude of the magnetic field is 3 x 10⁻⁶ T, then amplitude of the electric field for a electromagnetic waves is _____.

(a)

100 V m⁻¹

(b)

300 V m^-1

(c)

600 V m^-1

(d)

900 V m^-1

The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.

(a)

\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)

(b)

\(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

(c)

\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)

(d)

\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)

A radiation of energy E falls normally on a perfectly reflecting surface. Th e momentum transferred to the surface __________________.

(a)

\(\frac{E}{c}\)

(b)

2\(\frac{E}{c}\)

(c)

Ec

(d)

\(\frac { E }{ { c }^{ 2 } } \)

Which one of them is used to produce a propagating electromagnetic wave?

(a)

an accelerating charge

(b)

a charge moving at constant velocity

(c)

a stationary charge

(d)

an uncharged particle

Which of the following is NOT true for electromagnetic waves?

(a)

it transport energy

(b)

it transport momentum

(c)

it transport angular momentum

(d)

in vacuum, it travels with different speeds which depend on their frequency

Which of the following electromagnetic waves has the highest frequency?

(a)

radio waves

(b)

micro waves

(c)

X- rays

(d)

૪-rays

Which EM waves are used in medicine to destroy cancer cells?

(a)

radio waves

(b)

IR

(c)

૪ rays

(d)

UV rays

The existence of E.M. waves was confirmed experimentally by __________________.

(a)

Hertz

(b)

Maxwell

(c)

Huygens

(d)

Planck

A magnetic field is produced by ____________.

(a)

a changing electric field

(b)

a moving charge

(c)

both of them

(d)

none of them

Electromagnetic waves are discovered by _______________.

(a)

Hertz

(b)

Maxwell

(c)

Lenz

(d)

Huygens

The phase difference between electric and magnetic field vectors in the electromagnetic waves?

(a)

\(\frac{\pi}{4}\)

(b)

\(\frac{\pi}{2}\)

(c)

\(\pi\)

(d)

zero

The unit of μ_oε_o is ______________.

(a)

m S^-1

(b)

m² S^-2

(c)

m^-1 s

(d)

m^-2 S^-2

The velocity of light is maximum in ______________.

(a)

Diamond

(b)

Water

(c)

Vacuum

(d)

Glass

Which one of the following is not an electromagnetic waves?

(a)

Gamma rays

(b)

X-rays

(c)

Beta rays

(d)

Microwaves

Which of the following is used to study crystal structure?

(a)

microwave

(b)

infrared rays

(c)

ultraviolet rays

(d)

X-rays

A pure red glass plate when placed in the path of the light absorbs everything except__________.

(a)

yellow

(b)

black

(c)

green

(d)

red

The waves used in physiotherapy is ___________.

(a)

I-R rays

(b)

U-V rays

(c)

μ - waves

(d)

૪-rays

__________discovered electromagnetic induction.

(a)

Faraday

(b)

Maxwell

(c)

Ampere

(d)

Hertz

The relation between velocity of light, permeability and permittivity of free space in________.

(a)

\({ C }^{ 2 }=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)

(b)

\(C=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)

(c)

\({ \mu }_{ 0 }={ \varepsilon }_{ 0 }c\)

(d)

\({ \varepsilon }_{ 0 }={ \mu }_{ 0 }c\)

૪-rays are produced by _______.

(a)

radio active nuclei

(b)

high energy electrons

(c)

incandescent solids

(d)

electronic devices