6. A laboratory has 75 grams of a certain radioactive material. Two years ago, it had...

 

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6. A laboratory has 75 grams of a certain radioactive material. Two years ago, it had 100 grams. How much will the laboratory have 6 years from now? (a) 39.57 grams (b) 31.64 grams (c) 28.93 grams (d) 41.22 grams (e) None of the above. 7. Scientists observed that a small colony of penguins on a remote Antarctic island obeys the population growth law. There were 1000 penguins initially and 1200 penguins 15 months later. How long will it take for the number of penguins to double? (a) 5.71 years (b) 4.75 years (c) 3.56 years (d) 4.12 years (e) None of the above. age view 8. What is the half-life of a radioactive material if it takes 6 months for 1/3 of the material to decay? (a) 12.36 months (b) 10.26-months (c) 9.85 months (d) 11.14 months (e) None of the above. 9. At 12 noon on Jan. 1, the count in a bacteria culture was 400; at 4:00 pm the count was 1200. Let P(r) denote the bacteria count at time t and assume that the culture obeys the population growth law. What was the bacteria count (to the nearest bacterium) at 9 am on Jan. 17 (a) 210 (b) 164 (c) 175 (d) 196 (e) None of the above. 10. A thermometer is taken from a room where the temperature is 72" F to the outside where the temperature in 32" F. After 2 minutes, the thermometer reads 48" F. How many minutes does the thermometer have to be outside for it to read 36° FT (a) 6.31 min (e) 5.03 min (4) 4.87 min 10) None of the above 6. A laboratory has 75 grams of a certain radioactive material. Two years ago, it had 100 grams. How much will the laboratory have 6 years from now? (a) 39.57 grams (b) 31.64 grams (c) 28.93 grams (d) 41.22 grams (e) None of the above. 7. Scientists observed that a small colony of penguins on a remote Antarctic island obeys the population growth law. There were 1000 penguins initially and 1200 penguins 15 months later. How long will it take for the number of penguins to double? (a) 5.71 years (b) 4.75 years (c) 3.56 years (d) 4.12 years (e) None of the above. age view 8. What is the half-life of a radioactive material if it takes 6 months for 1/3 of the material to decay? (a) 12.36 months (b) 10.26-months (c) 9.85 months (d) 11.14 months (e) None of the above. 9. At 12 noon on Jan. 1, the count in a bacteria culture was 400; at 4:00 pm the count was 1200. Let P(r) denote the bacteria count at time t and assume that the culture obeys the population growth law. What was the bacteria count (to the nearest bacterium) at 9 am on Jan. 17 (a) 210 (b) 164 (c) 175 (d) 196 (e) None of the above. 10. A thermometer is taken from a room where the temperature is 72" F to the outside where the temperature in 32" F. After 2 minutes, the thermometer reads 48" F. How many minutes does the thermometer have to be outside for it to read 36° FT (a) 6.31 min (e) 5.03 min (4) 4.87 min 10) None of the above

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6 All the radioactive material follows first ordero In AoA Kt where Ao The amount of radioisotop ... View the full answer