Hanu2012

An 18 m tall tree is broken during a severe storm. The distance from the base of the trunk to the point where the tip touches the ground is 12 m. At what height did the tree break?

In a vacuum, which colour of light travels fastest  red, blue, or green? Explain. Which colour travels fastest in a block of glass?

Brain buster: A laser sends red light of wavelength 650 nm from air into water in a swimming pool. The index of refraction of the water is 1.33. (a) What wavelength will the light have in the water? (b) What colour would light of this wavelength appear if...