Light of wavelength 500 nm illuminates a round 0.50-mm diameter hole. A screen is placed 6.3 m behind the slit. What is the diameter of the central bright area on the screen?
A) 15 mm
B) 270 ?m
C) 7.7 mm
D) 3800 ?m
Answer: A
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How are monomers and polymers related?
A) A monomer is a small, repeating unit that makes up a polymer. B) A monomer is one strand of a polymer. C) A monomer is made when you condense a polymer through polymerization. D) A polymer is chemically identical to a monomer, only larger. E) none of the above
A solenoid carrying an electric current, if free to rotate when placed in a magnetic field, will tend to orient its axis ________ (parallel, perpendicular, anti-parallel) to the magnetic field.
Fill in the blank(s) with the appropriate word(s).
Why do the present methods of finding extrasolar planets (Doppler measurement and planetary transits) not favor finding solar systems like ours?
What will be an ideal response?
Melanie says that when a diver enters an underwater cave of height y, the pressure on her is no greater than ?Wgy. Rosalind says that if the bottom of the cave is a distance Y below the water surface, the pressure on the soles of the diver's feet can reach ?WgY. Which one, if either, is correct? (The density of water is ?W.)
A. Melanie, because the roof of the cave absorbs the water pressure from above. B. Melanie, because only the fluid directly above any volume of the fluid can contribute to the pressure on that volume. C. Rosalind, because a fluid exerts equal pressure in all directions at a given depth. D. Rosalind, because the pressure also depends on ?c, density of the material above the cave roof, so that p =?cg(Y-y) +rWgy. E. Melanie, because the pressure equals p = ?WgH??cg(H?h).