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lemusanaisabel6064
23.09.2019 •
Mathematics
The half-life of helium-5 is 7.6 x 10^-22 seconds, and the half-life of helium-9 is 7 x 10^-21 seconds. approximately how many times greater is the half-life of helium-9 than that of helium-5?
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Ответ:
(7/7.6)(10^-21/10^-22)
Rule for division of similar bases with exponents...
(a^b)/(a^c)=a^(b-c)
In this case we have (10^-21)/(10^-22)=10^(-21--22)=10^1
And 7/7.6≈0.921, and we only had two significant figures so 0.92 works
0.92X10^1
9.2
So the half life of helium-9 is about 9.2 times greater than the half life of helium-5
Ответ:
yes they are
step-by-step explanation:
when a line cuts two parallel lines, the alternate interiors angles are congruent. hope this :