Author Question: A material has an index of refraction of 1.92 for light from a 560 nm source. What is the speed of ... (Read 99 times)

sarasara · **on:** Jul 28, 2018

A material has an index of refraction of 1.92 for light from a 560 nm source. What is the speed of light for this wavelength within the material? (c = 3.00 108 m/s)
a. 2.19 108 m/s
c. 1.56 108 m/s
b. 4.68 108 m/s
d. 1.92 108 m/s

Question 2

Metal lids on glass jars can often be loosened by running them under hot water. Why is this?
a. The hot water is a lubricant.
b. The metal and glass expand due to the heating, and the glass being of smaller radius expands less than the metal.
c. The metal has a higher coefficient of thermal expansion than glass so the metal expands more than the glass, thus loosening the connection.
d. This is just folklore.