What are two reasons why a home computer scanner requires electromagnetic waves to operate?
A. X-rays are needed to either pass through or be absorbed by the
objects they contact.
B. Red light shines on patterns of black and white, producing a
pattern from the reflected light.
C. The charge-coupled device contains a silicon chip that releases
electroms by the photoelectric effect, producing an image.
D. Visible light needs to reflect off an object and be captured by a
charge-coupled device.

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

What sort of waves exhibit the doppler effect?

Adiver named jacques observes a bubble of air rising from the bottom of a lake (where the absolute pressure is 3.50 atm) to the surface (where the pressure is 1.00 atm). the temperature at the bottom is 4.00 ∘c, and the temperature at the surface is 23.0 ∘c.what is the ratio of the volume of the bubble as it reaches the surface (vs) to its volume at the bottom (vb)? if jaques were to hold his breath the air in his lungs would be kept at a constant temperature. would it be safe for jacques to hold his breath while ascending from the bottom of the lake to the surface?