In the video about half-life, Ra-223 decays to Rn-219 by alpha decay with a half-life of 11 days. Assuming you start with 80 grams of Ra-223, how much would be left after 33 days? 5 grams 10 grams 20 grams 40 grams

the answer is b. dilution

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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