3.Firefighters’ uniform is coated with a plastic that is fire resistant. Identify the plastic from the given
options.
a. Teflon
b. Melamine
c. PET
d. Polyester

It could possibly be beneficial if the experiment is successful.

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.

Ithink the answer is e

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