Heavy water has a chemical formula d_2o. it is a form of water in which all hydrogen is deuterium ^2h and has a density of 1.11 g/cm^3. neglect the contribution of oxygen atoms. calculate the number of collisions required to slow down a neutron from 2 mev to 0.025 ev heavy water. determine the diffusion length of thermal neutrons in heavy water.

What is the frequency of a light wave with a wavelength of 620nm

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?