Of the following telescopes, which one would best be able to pierce through the Earth's atmosphere and function on the surface of the Earth?
A.
a visible-light telescope
B.
a radio telescope
C.
an X-ray telescope
D.
an infrared telescope

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?