Adiffraction grating with 4000 lines/cm is illuminated by light from the sun. the solar spectrum is spread out on a white wall across the room. (a) at what angle from the center line does blue light (400 nm) appear? (b) at what angle from the center line does red light (650 nm) appear?

Consider the following problem: a box with an open top is to be constructed from a square piece of cardboard, 3 ft wide, by cutting out a square from each of the four corners and bending up the sides. find the largest volume that such a box can have.

In a system, when potential energy decreases, then entropy also decreases. true false

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.