Light with a wavelength of 5.0 . 10-7 m strikes a surface that requires 2.0 ev to eject an electron. calculate the frequency of the glven wave.
1.5 x 102
6.0 x 1014
17 x 10-15
6.0 x 10-16

How have the competing explanations' experiments on atoms affected the development of the atomic model?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

Sound travels slower in colder air that it does in warmer air. make a claim about the effect of air temperature on the speed of sound. support your claim with evidence