A soap bubble has an index of refraction of 1.33. What minimum thickness of this bubble will ensure maximum reflectance of normally incident 530. nm wavelength light?
What will be an ideal response?
99.6 nm
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In a composite material, the electrical resistivity for current parallel to the axis of the 2nd phase follows the rule of
(a) Mathiessen. (b) Nordheim. (c) Mixtures. (d) Fermi-Dirac.
Why can't we see past the cosmological horizon?
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born. B) We do not have big enough telescopes. C) The cosmological horizon is infinitely far away, and we can't see to infinity. D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.
Which of the following things is an “extended object”? For each item, answer “A” if the item is an acceptable extended object, “B” if the definition of an extended object applies badly to the item, and “D” if it is debatable.
(a) An electron (b) An atom (c) A rock (d) A swarm of bees (e) The earth’s atmosphere (f) The water in an ocean current (g) Sugar molecules dissolved in a cup of water (h) The vacuum between galaxies
A bicyclist starts down a hill with an initial speed of 2.0 m/s. She moves down the hill with a constant acceleration, arriving at the bottom of the hill with a speed of 8.0 m/s. If the hill is 12 m long, how long did it take the bicyclist to travel down the hill?