The wavelength of visible light varies from 380 nm to 750 nm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 6.8e-07 m.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?

(04.01 lc) which of the following is true about science? (5 points) select one: a. it is not influenced by social conditions. b. it is not determined by external local factors. c. political conditions are unable to influence it. d. economic concerns may prevent it from solving problems.