The NaCl molecule has a bond energy of 4.26eV; that is, this energy must be supplied in order to dissociate the molecule into Na and Cl atoms. Required:
a. What are the minimum frequency and maximum wavelength of the photon necessary to dissociate the molecule?
b. In what part of the electromagnetic spectrum is this photon?

What are similarities and differences between refraction, reflection, diffraction and absorption?

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)