Answer:
15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.
The half-life is the time after which half of the initial quantity of a radioactive substance is left .
Given here,
The half-life of K-42 = 12.4 hours
The initial quantity of K-42 = 500 gm
The final quantity after 62 hours = ?
The number of half cycle
\bold { = 62\times \dfrac 1{12.4} = 5,}=62×
12.4
1
=5,
Thus the number of half life cycles in 62 hours is 5,
After 1 half life \bold {= \dfrac {500}{2} = 250}=
2
500
=250
After 2 half lives \bold {= \dfrac {250}{2} = 125}=
2
250
=125
After 3 half lives \bold {= \dfrac {125}{2} = 62.5}=
2
125
=62.5
After 4 half lives \begin{gathered}\bold {= \dfrac {62.5}{2} = 31.25}\\\end{gathered}
=
2
62.5
=31.25
After 5 half lives \begin{gathered}\bold {= \dfrac {31.25}{2} = 12.625}\\\end{gathered}
=
2
31.25
=12.625
15.625 g of a 500 gram sample of potassium-42 with 12.4 hours of Half -life is left after 62 hours.
To know more about Half life,
brainly.com/question/4483570
BRAIN LESS ANSWER
ANSWER IS THAT CRRECT
Answer:
mjjmjmjjmnbhbhjhgvcxcfgvhjgfv
Explanation:
Osmosis is the process cells use to move water molecules in and out of the cell through the cell membrane .through osmosis the cell will lose or gain water molecules to become a
Equal to the concentration in their environment
Answer:
C. a sequence of nucleotides in DNA that codes for a functional product.
Explanation:
A gene is referred to as a nucleotide sequence in DNA that codes for the synthesis of a functional product such as an RNA or a protein. It is also referred to as the functional and basic unit of hereditary. A gene is also found on a chromosome and differs from DNA because a DNA just comprises nucleotides and is found in the cell nucleus.
Genes carry genetic information which can be transferred to the offspring from the parents. These genetic information could be the color of the hair, height, color of the eyes and other traits that can be passed from parents to offspring.
I am pretty sure that the thing which most likely happen to plants if they did not have a waxy outer coating is being revealed by the last option D. They would be harmed by insects and UV radiation. Every plant has to be protected by membrane so that it would be able to deal with drought small invaders and other external forces.