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(b)radio waves


                 (c)visible rays


                (d) microwave


               7. Light waves constitutes

                  (a) mechanical waves


                  (b)magnetic waves


                  (c)electromagnetic waves

                (d)none of these


               8. Human body radiates________________ of  e.m spectrum.


               9. Shorter the wavelength of an e.m wave , ________________energy it carries.


               10. Waves used to transmit cellular telephone message are_______________.

               11. Electromagnetic waves are produced by ______________ charges.


               12. Human eye can detect _______________ part of e.m spectrum.


               13. To study structure of crystals______________ are used.

               14. How are e.m waves produced by oscillating charges?


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               15. Find the wavelength of e.m waves of frequency 6 x 10  Hz in free space. Give
               its two applications.

               16. Why are infrared radiations referred to as heat waves also?


               17. (a) Discuss the inconsistency of Ampere’s circuital law.


                     (b) How is it modified by Maxwell?


                      (c) Hence write Maxwell-Ampere’s circuital law.
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