The drawing shows a rectangular block of glass (n = 1.52) surrounded by air. A ray of light starts out within the glass and travels toward point A, where some or all of it is reflected toward point B.  b. At what angle must the incident beam have originally struck the glass? (What is the original angle of incidence from outside the glass?)

__________drugs initiate a cell response after binding; whereas __________ drugs do not because of incomplete binding.

EXTRA CREDIT:  A good lede: 

When the combined effect of 2 drugs is less than either alone, this indicates a(n) __________ effect.

Which law speeds drug approval because of an eminent threat to public health?

A hobo on a train is playing a tuba, holding out an A (at 110 Hz). d) At what intensity level do you hear the stationary tuba?   Answer in dB.

Written correctly? Style, grammar, punctuation, spelling, etc. “It was fate,” he said, “we knew we’d catch him.”

AP STYLE: Mark true for correct, false for incorrect (None of these is at the beginning or end of a sentence.) Britney Spear’s CD

When sodium yellow light (λ = 589 nm) is used in a double-slit experiment, the first-order maximum (bright spot) is 0.035cm from the central maximum. When another source of unknown wavelength is used on the same slit and screen setup, the first-order maximum occurs at 0.032 cm from the center.  What is the unknown wavelength in nm? *Hint: use the small angle approximation,

Written correctly? Style, grammar, punctuation, spelling, etc. Two million dollars is a lot of money, Scrooge told Tiny Tim.