Answer:
a) (), b) (), c) , d) , e) (), f) (), g) ()
Step-by-step explanation:
All radioactive isotopes decay exponentially, the mass of the isotope as a function of time (), measured in grams, is defined by:
(1)
Where:
- Initial mass of the isotope, measured in grams.
- Decay rate, measured in or or .
- Time, measured in minutes, days or years.
We define the decay rate in terms of half-life by using the following expression:
(2)
Where is the half-life of the isotope, measured in minutes or years.
Now we proceed to determine the missing values:
a) Polonium-200 ()
b) Lead-194 ()
c) Iodine-125 ()
d) Kryption-75 ()
e) Strontium-79 ()
f) Uranium-229 ()
g) Plutonium-239 ()
Answer: The numbers that are rational numbers are A, C, and F.
Step-by-step explanation: This is because all non-perfect square roots are always irrational. Also, perfect square roots are always <em><u>RATIONAL. </u></em> Therefore, the rational numbers of the choices given are
Answer:
19 in
Step-by-step explanation:
Since, one revolution is equal to the circumference of the wheel.
C= πd
->The wheel of a compact car has a 25-in. diameter. The circumference of the compact car will be:
C= π x 25
C= 25 π in
->The wheel of a pickup truck has a 31-in. diameter. The circumference of the pickup truck will be:
C = π x 31
C= 31π in
Next, is to determine differences in distance 'd' traveled by subtraction the circumferences
d= 31π - 25π
d=6π (since π= 3.14)
d= 6 x 3.14
d=19 in
Therefore, the pickup truck wheel traveled 19in farther in one revolution than the compact car wheel
Answer:
it is C but that is not 100 points :'(
Step-by-step explanation: