Which of the following churches contains great examples of the use of ribbed vaulting?
a. durham cathedral
b. st. etienne
c. church of san clement
d. both a and b

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat