the amount of a sample remaining after t days is given by the equation $p(t)=a\\left(\\frac{1}{2}\\right)^{\\…

the amount of a sample remaining after t days is given by the equation $p(t)=a\\left(\\frac{1}{2}\\right)^{\\frac{t}{h}}$, where a is the initial amount of the sample and h is the half - life, in days, of the substance. a scientist has a 10 - mg sample of a radioactive isotope. the isotope has a half - life of 8 days. after 16 days, how much of the radioactive isotope remains?\n2.0 mg\n2.5 mg\n5.7 mg\n7.1 mg

the amount of a sample remaining after t days is given by the equation $p(t)=a\\left(\\frac{1}{2}\\right)^{\\frac{t}{h}}$, where a is the initial amount of the sample and h is the half - life, in days, of the substance. a scientist has a 10 - mg sample of a radioactive isotope. the isotope has a half - life of 8 days. after 16 days, how much of the radioactive isotope remains?\n2.0 mg\n2.5 mg\n5.7 mg\n7.1 mg

Answer

Answer:

B. 2.5 mg

Explanation:

Step1: Identify given values

$A = 10$, $h=8$, $t = 16$

Step2: Substitute values into formula

$P(t)=A\left(\frac{1}{2}\right)^{\frac{t}{h}}$, so $P(16)=10\times\left(\frac{1}{2}\right)^{\frac{16}{8}}$

Step3: Calculate exponent value

$\frac{16}{8}=2$, so $P(16)=10\times\left(\frac{1}{2}\right)^{2}$

Step4: Calculate power value

$\left(\frac{1}{2}\right)^{2}=\frac{1}{4}$

Step5: Calculate final amount

$P(16)=10\times\frac{1}{4}=2.5$ mg