It will take 28 days to let the radioactivity fall below 25%.
<h3>What is Half Life ?</h3>
Half life can be described as the time required by the radioactive compound to reduce to half of the original value of concentration.
It is given that
Radioactive phosphorus-32 decays with a half-life of 14.0 days
25% of the initial measure at what time =?
For 50% decay the time needed is 14 days
for decay of the next 50% of the amount left the time taken will be another 14 days
2nd half life = 25% decay of the substance = 28 days
Therefore it will take 28 days to let the radioactivity fall below 25%.
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Answer:
Proteins
Explanation:
Amino acids act as monomers (a single unit used to form polymers) , the polymer will be a long chain of individual amino acids. An amino acid chain forms a protein. These proteins are also known as peptides.
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Answer:
A. Pascals
Explanation:
A unit Pascal is an SI unit used for internal pressure.
Centimeters cubed is volume.
Liters is measurement.
Kelvin is temperature.
Answer:
V = 1.35 m/s
Explanation:
Given that,
Mass of a railroad car, m₁ = 25,000 kg
Initial speed of a railroad car, u₁ = 4.5 m/s
Initial speed of railroad car that is full of coal, u₂ = 0 (at rest)
We need to find the final velocity of the two railroad cars if they move as one after the collision. It is a case of inelastic collision in which the momentum remains conserved. Using the conservation of linear momentum as follows :
V is the final speed and u₂ = 0
So, the final velocity of the two railroad cars is 1.35 m/s.