The Southern hemisphere of Mars is at
A) an average elevation and is covered with impact craters
B) a higher than average elevation and is relatively smooth
C) a higher than average elevation and is covered with impact craters
D) a lower than average elevation and is relatively smooth
C
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What is this galaxy doing that keeps it from being idle?
A: The black hole at the center of the disk is sucking in the stars in the disk, which is gradually disappearing. B: It is fragmenting into different irregular parts as the universe evolves. C: It is oscillating between compressed and rarefied states, changing by a factor of two in size every million years. D: Stars are forming in the spiral arms and the disk is rotating. E: The galaxy evaporates quickly so that it will only be around for another million years.
What was the conclusion of Feynman's first thought experiment regarding waves and particles, in which indestructible bullets are fired from a wobbly gun at a pair of slits?
a. When both slits are open, the total of bullets in this sand is the sum of bullets shot through one slit and the other. b. A bullet through one slit affects the probability that the next bullet goes through the same slit. c. Bullets rebounding from closed slits show refraction patterns. d. When both slits are open, interference patterns keep the number of bullets from reaching the full number shot one slit and then the other. e. Three times as many bullets go through two open slits as through one and then the other.
A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 0.00 eV B) 0.37 eV C) 0.47 eV D) 0.53 eV
The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A) It is increased by a factor of 2. B) It is increased by a factor of 4. C) It is reduced by a factor of 2. D) It is reduced by a factor of 4. E) It is reduced by a factor of 8.