How old was the universe when light from the most distant galaxies in the Hubble Ultra Deep Field was emitted?
A: 100,000 years.
B: 5 million years.
C: 10 billion years.
D: 400 million years.
E: 800 million years.
Answer: E: 800 million years.
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The frequency of a certain wave is 10 hertz and its period is
A) 0.1 second. B) 10 seconds. C) 100 seconds. D) none of the above
Force is a vector quantity
Indicate whether the statement is true or false
Mort stands on Earth. Velma moves away from him in a rocket at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma
As the tip of the beam passes her rocket, Mort observes the beam to move just 1000 km/s faster than Velma, while Velma observes the beam to move at 300,000 km/s. Whose observation is correct? A) Mort's B) Velma's C) both D) neither
Natural processes tend to move toward a state of less disorder
Indicate whether the statement is true or false