If light takes 4 billion years to reach us from a distant galaxy, how much further away is the distant galaxy than the Andromeda galaxy which is 2 million light years away?
a) 4 billion times
b) 200 times
c) 20 times
d) 2000 times
e) 2 million times
Ans: d) 2000 times
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Which pulsate faster?
a. lower mass, smaller stars b. higher mass, larger stars c. dimmer, smaller stars d. brighter, smaller stars
Mean Life: Isotope A has a decay constant of 0.861 s-1 and isotope B has a decay constant of 0.627 s-1. Which isotope has a longer mean life (time constant)?
A. isotope A B. isotope B
A bullet is fired with a certain velocity at an angle ? above the horizontal at a location where g = 10.0 m/s2. The initial x- and y-components of its velocity are 86.6 m/s and 50.0 m/s respectively. What is the range of the bullet?
A) 500 m B) 1000 m C) 100 m D) 866 m E) 433 m
A hospital patient has been given a sample of 131I , which has a half-life of 8.04 days. This sample is decaying at 5.9 times the acceptable level for exposure to the general public
How long must the patient wait for the decay rate of the sample to reach the acceptable level? A) 21 days B) 14 days C) 9.9 days D) 8.9 days