What 2 types of electromagnetic energy have wavelenghts of 0.76 cm?
Are you sure that you mean "0.76 cm"?
Since this is not my area of expertise, I searched Google under the key words "electromagnetic energy wavelengths 0.76 cm" to get these possible sources:
http://books.google.com/books?id=Nyka0vuWMzMC&pg=PA59&lpg=PA59&dq=electromagnetic+energy+wavelengths+0.76+cm&source=web&ots=3PgX3O3ZAK&sig=0ifyCJcSEjRxO7Smlq3z9lJlR3E&hl=en&sa=X&oi=book_result&resnum=2&ct=result
http://www.ucalgary.ca/GEOG/Virtual/Remote%20Sensing/energy.html
http://74.125.95.132/search?q=cache:W3ABN7LDhgsJ:www.yale.edu/gsp/gis-files/remote_sensing_intro.pdf+electromagnetic+energy+wavelengths+0.76+cm&hl=en&ct=clnk&cd=4&gl=us&client=safari
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.