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

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