Answer these questions in order

QUESTION 4 The population of a bacteria sample doubles every 6 hours. How long would it take for the population to triple? o a. about 9 hours o b. about 18 hours o c. about 9.5 hours o d. about 12 hours QUESTION 5 The loudness of a sound, in decibels (dB), is given by 10log - ), where / is the intensity of the sound (measured in watts per square meter), and /, is 10 2 watts per square meter. If the loudness of a normal conversation is typically 60 dB, what is its intensity? o a. 10" watts per square meter o b. 10 watts per square meter o c. 6x 10"" watts per square meter o d. 10"watts per square meter QUESTION 6 In May 2015, an earthquake originating in Galesburg, MI had a magnitude of 4.2 on the Richter scale. In September 2012, a much smaller earthquake originating in Stony Point, MI had a magnitude of 2.5. If the magnitude of an earthquake is given by the formula M - log - , where / is the intensity of the earthquake and /, is a small reference intensity, how many times larger was the intensity of the Galesburg earthquake compared to the Stony Point earthquake? o a. about 50 times larger o b. about 1.7 times large o c. about 1.6 times larger o d. about 5 times largerQUESTION 1 Gold-192 is a radioactive isotope with a half-life of 4.95 hours. How long would it take for a 15 gram sample of Gold-192 to decay until only 3 grams remain? o a. about 2.13 hours o b. about 24.75 hours O C. about 11.5 hours o d. about 7.92 hours QUESTION 2 Gold-192 is a radioactive isotope with a half-life of 4.95 hours. How long would it take for a 25 gram sample of Gold-192 to decay until only 2 grams remain? o a. about 18 hours o b. about 9.1 hours o c. about 31 hours o d. about 61.9 hours QUESTION 3 If the number of students at a particular high school who participate in after-school drama programs increases at a rate of 8% per year, how long would it take for the number of students participating in after-school drama programs to double? o a. about 25 years o b. about 3.6 years o c. about 9 years o d. about 12.5 years