During the propagation of electromagnetic waves in a medium __________________.

(a)

electric energy density is double of the magnetic energy density

(b)

electric energy density is half of the magnetic energy density

(c)

electric energy density is equal to the magnetic energy density

(d)

both electric and magnetic energy densities are zero

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)

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

Who produced the electromagnetic waves first?

(a)

J.C.Bose

(b)

Marconi

(c)

Maxwell

(d)

Hertz

Speed of electromagnetic wave is the same for all ______________.

(a)

wavelength

(b)

media

(c)

intensities

(d)

frequencies

Electromagnetic waves are produced by _____________.

(a)

static charge

(b)

moving charge

(c)

an accelerating charge

(d)

chargeless particles

Which of the following electromagnetic waves has the highest frequency?

(a)

radio waves

(b)

micro waves

(c)

X- rays

(d)

૪-rays

Which of the following E.M waves has the longest wavelength?

(a)

Radio waves

(b)

IR

(c)

X-rays

(d)

visible

The electric and magnetic field of an EM wave are _____________.

(a)

in phase and perpendicular to each other

(b)

in phase and parallel to each other

(c)

in opposite phase and perpendicular to each other

(d)

in opposite phase and parallel to each other

The EM waves do not transport _______________.

(a)

energy

(b)

charge

(c)

momentum

(d)

information

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

(a)

radio waves

(b)

IR

(c)

૪ rays

(d)

UV rays

Which of the following is a special aspect of EM wave?

(a)

can be deflected by electric field

(b)

can be deflected by magnetic filed

(c)

can be deflected by both electric & magnetic filed

(d)

none of these

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

(a)

Hertz

(b)

Maxwell

(c)

Huygens

(d)

Planck

If the velocity of light in a medium is 2.25 x 10⁸ ms^-1 then the refractive index of the medium will be _______________.

(a)

1.5

(b)

0.5

(c)

1.33

(d)

1.73

A magnetic field is produced by ____________.

(a)

a changing electric field

(b)

a moving charge

(c)

both of them

(d)

none of them

Accelerated charges would produce _____________.

(a)

sound waves

(b)

૪-rays

(c)

magnetic waves

(d)

electromagnetic waves