An electron in a hydrogen atom drops from the n = 4 (-0.85 eV) to the n = 3 (-1.51 eV) state. What is the energy of the emitted radiation?
1. -2.36 eV
2. 0.66 eV
3. -0.66 eV
4. 2.36 eV

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

The ph is the a. independent variable b. the dependent variable c. control group