Radioactivity 1
| First | First | Last | Quiz Score Total | Question 1 | Image 1a1 | 1ai) How many protons are in potassium isotope above? | 1aii) How many neutrons are in potassium isotope above? | 1aiii) How many electrons are in potassium isotope above? | Image 1a2 | 1bi) How many protons are in potassium isotope above? | 1bii) How many neutrons are in potassium isotope above? | 1biii) How many electrons are in potassium isotope above? | 1c) Using your answer to a and b, How do we know that these are isotopes? | 1d) Potassium-40 is a radioactive isotope. What is meant by "radioactive"? | 1e) Radioactive decay is a random process. What does this mean? | 1f) A radioactive isotope has an activity of 50 Bq. How many nuclei will have decayed after three minutes? | 1f) Show Your Workings: | 1g) A scientist used a Geiger-Muller tube to measure the count-rate of a radioactive sample. Explain why the count rate will not be the same as the activity? | Quiz Percentage Grade |
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| First | First | Last | Quiz Score Total | Question 1 | Image 1a1 | 1ai) How many protons are in potassium isotope above? | 1aii) How many neutrons are in potassium isotope above? | 1aiii) How many electrons are in potassium isotope above? | Image 1a2 | 1bi) How many protons are in potassium isotope above? | 1bii) How many neutrons are in potassium isotope above? | 1biii) How many electrons are in potassium isotope above? | 1c) Using your answer to a and b, How do we know that these are isotopes? | 1d) Potassium-40 is a radioactive isotope. What is meant by "radioactive"? | 1e) Radioactive decay is a random process. What does this mean? | 1f) A radioactive isotope has an activity of 50 Bq. How many nuclei will have decayed after three minutes? | 1f) Show Your Workings: | 1g) A scientist used a Geiger-Muller tube to measure the count-rate of a radioactive sample. Explain why the count rate will not be the same as the activity? | Quiz Percentage Grade |