what is the energy of a photon of infrared radiation with a frequency of 2.53 ×  1012  hz? planck’s constant is6.63 ×  10–34  j • s.a. 1.68 ×  1023  j        b. 1.68 ×  1047  j      c. 1.68 ×  10–21  j        d.  1.68 ×  10–45  j

Surface currents are caused by blank space . question 14 options: surface currents are caused by? differences in water temperature high salinity differences in density wind forces

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

One nanometer is equal to how many meters?