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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A. 2 B. 3 C. 4 D. 5 E. 6
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?
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.
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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.