If it takes 9.793 x 10-19 J of energy to remove one electron from a molecule of calcium, what is the wavelength of light capable of causing this effect? Use the equation E = hc/a, and
solve for A.

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Lewis structure and molecular geometry for nh2cl

What is the subscript for oxygen in its molecular formula