Which type of binary system have pairs of stars that are so close together that they look like one single point?
a. radio binary
b. eclipsing binary
c. visual binary
d. spectroscopic binary
e. neutron star binary
d
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Two harmonic waves are described by 
What is the magnitude of the speed (in m/s) of the two traveling waves?
A. 16 B. 4.0 C. 8.0 D. 0.25 E. 2.0
A tank contains benzene, which has index of refraction 1.50. A dime is on the bottom of the tank. When viewed at normal incidence the dime appears to be 61 cm below the surface of the benzene. What is the actual depth of the benzene?
What will be an ideal response?
Two fixed navigation beacons mark the approach lane to a star. The beacons are in line with the star and are 40 Mm apart. A spaceship approaches the star with a relative velocity of 0.30 c and passes the beacons
The passage of the ship between the beacons is timed by observers on the beacons. The time interval of the passage is closest to: A) 440 ms B) 470 ms C) 420 ms D) 250 ms E) 170 ms
The time interval during which a nucleus has a 50% probability of decaying is its _________
Fill in the blank(s) with correct word