Two beams of coherent light travel different paths arriving at point P. If the maximum constructive interference is to occur at point P, the two beams must
A) arrive 180° out of phase.
B) arrive 90° out of phase.
C) arrive 45° out of phase.
D) travel paths that differ by a whole number of wavelengths.
E) travel paths that differ by an odd number of half-wavelengths.
D
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When a fixed amount of ideal gas goes through an isothermal expansion,
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature must decrease. E) its pressure must increase.
If Hubble's constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of 0.95 times the speed of light, how far away is the quasar?
a. 4100 Mpc b. 0.014 Mpc c. 67 Mpc d. 74 Mpc e. 300,000 Mpc
The size of Olympus Mons suggests that the crust of Mars is very thick
a. True b. False Indicate whether the statement is true or false
The best place to search for meteorites on Earth is in parts of _______________
Fill in the blank(s) with correct word