Why is pure silicon a poor conductor at room temperature

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

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Explain how global warming could have affected yellowstone frog and salamander habitat's, resulting in changes in the populations of these species