What is the critical angle c for total internal reflection if the material is clear acrylic, with a refractive index of 1.5?

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

70 give a real life example showing how sensory neurons work with the motor neurons