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WORKSHEET (Electromagnetic waves)


               1) If            represents wavelength of X-rays, microwaves and visible rays then



               (a)                  (b)                    (c)                           (d)












               2) Human body radiate
               (a)microwave             (b)X-rays                 (c)infrared rays                     (d)gamma rays
               3) Properties of em radiation are identified by using there
               (a) colour                     (b)their use                (c)speed                    (d)frequency or wavelength
               4) In an em wave , the phase difference between electric field and magnetic field is
               (a)0                              (b)                            (c)                              (d)


               5) Electromagnetic waves are produced by __________________ charges.

               6) Human eye can detect_______________ part of em spectrum.

               7) An em wave exerts pressure on the surface on which it is incident. Justify.


               8)Write the relation for the speed of em wave in terms of amplitudes of electric and magnetic
               fields.

               9) Name the em radiation used for (a) water purification and (b) eye surgery.


               10) A parallel plate capacitor is being charged by a time varying current. Explain briefly how
               Ampere’s circuital law is generalized to incorporate the effect due to displacement current.
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