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Key Quiz 7.6
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1
A spaceship is invaded by an alien species. If the initial invasion force consists of 4 aliens and they double in population every 2 hours, which of the following represents the number of aliens aboard the ship after a week?
A)4(2)7x24/2
B)4(2)7/2
C)224x7/2
D)27/2
2
The number of people who speak Gibberish (an obscure dialect) halves every 30 years. If 240 000 people speak Gibberish today, how many people will be speaking it in 200 years?
A)216 300
B)2362
C)236
D)0
3
The area of a particular oil slick can be modelled by the equation A = 500(2)n/3, where A is area in square miles and n is days since the slick started. What is the doubling time of the slick?
A)500 days
B)3 days
C)2 days
D)1/3 day
4
The area of a particular oil slick can be modelled by the equation A = 500(2)n/3, where A is area in square metres and n is days since the slick started. How big will the slick be in a month if nothing is done to clean it up?
A)630 m2
B)2520 m2
C)12 700 m2
D)512 000 m2
5
The relation C = (1/2)n/5730 can be used to calculate the concentration C of radioactive carbon, in parts per trillion, remaining n years after death. Find the concentration of radioactive carbon in a 3200 year-old fragment of reed papyrus.
A)0.96 parts per trillion
B)0.68 parts per trillion
C)0.29 parts per trillion
D)0.02 parts per trillion





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