What is the energy of a photon that emits a light of frequency 6.42 x 1014 Hz? A. 3.10 x 10-19 J
B. 4.25 x 10-19 J
C. 9.69 x 10-19 J
D. 4.67 x 10-19 J​

Which substances have the lowest melting points: ionic covalent, or metallic

Asa choose the correct set of reaction coefficients to properly balance the following chemical equation according to the law of conservation of mass: __s8 + __o2 ==> __so2 1, 1, 8 1, 8, 1 1, 8, 8 8, 1, 1

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory