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

Physics & Space Science

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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

Physics & Space Science

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?

Physics & Space Science

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

Physics & Space Science

The time interval during which a nucleus has a 50% probability of decaying is its _________

Fill in the blank(s) with correct word

Physics & Space Science