The H? line has a wavelength of 434.0 nm when observed in the laboratory. If the H? line appears in a stars spectrum at 434.5 nm, what is the radial velocity of the star?
a. 346 km/s away from the observer
b. 346 km/s toward the observer
c. 1.3 × 10^8 m/s away from the observer
d. 1.3 × 10^8 m/s toward the observer
e. The radial velocity of the star cannot be determined from this information.
a
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Quarks come in how many flavors?
A. 2 B. 3 C. 4 D. 5 E. 6
A standing wave is set up in a 2.0-m string fixed at both ends. The string vibrates in 3 distinct segments when driven by a 120-Hz source. In how many distinct standing wave segments will the string vibrate if the tension is increased by a factor of 4?
a. 3 c. 9 b. 6 d. No standing wave pattern occurs.
An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east
How fast was the boy moving just before the collision?
Most of the hydrogen we use in the United States comes from
A. pockets of hydrogen gas found underground B. hydrogen gas extracted from the atmosphere C. hydrogen produced in nuclear reactors D. It is manufactured from fossil fuels and/or water.