The energy difference between the upper and lower levels in a certain laser is 1.9593 eV. What is the wavelength of the light emitted by the laser?
632.9 nm
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If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km b. 350,000 km c. 194 km d. 700,000 km e. 4656 km
Why is it surprising that spiral arms are stable structures, lasting billions of years? a. Differential rotation should tear the arms apart
b. Gas and dust clouds should run out of material to make young stars. c. Supernova explosions should disrupt the arms. d. Globular clusters are continuously passing through the arms. e. Gravity should pull the arms down into the center of the galaxy.
A pickup truck moves at 25 m/s toward the east. Ahmed is standing in the back and throws a baseball in what to him is the southwest direction at 28 m/s (with respect to the truck)
A person at rest on the ground would see the ball moving how fast in what direction?
Mercury completes one orbit around the Sun in 8 days
a. True b. False Indicate whether the statement is true or false