OB. 25 g
OC. 75 g
OD. 100 g
Answer:
B. 25 g
Explanation:
Given:
The initial mass of radioactive isotope is,
There is exponential decay of the isotope with time.
Half life means the time in which the given mass reduces by half. For every half life, the mass reduces by half of the previous mass.
So, for the first half life, the mass that remains is given as:
Now, for the second half life, the mass 50 g is again reduced to half.
So, the mass that remains after 2 half-lives is given as:
Therefore, the radioactive isotope that will remain in the sample after 2 half-lives is 25 g.
Answer:
its 12.5 g for anyone else who had different options
Explanation:
Answer:
496.7 K
Explanation:
The efficiency of a Carnot engine is given by the equation:
where:
is the temperature of the hot reservoir
is the temperature of the cold reservoir
For the engine in the problem, we know that
is the efficiency
is the temperature of the cold reservoir
Solving for , we find:
particle accelerator?
- weak nuclear force
- electromagnetism
- strong nuclear force
- gravity
Answer:gravity
Explanation:
i just took the test and it was right!
B.they fall faster
C.they don’t fall
D.They fall at the same rate as they do on earth
A) They move slower
Gravity force is determined by mass and the size of the moon. Since the mass of the moon is significantly lower than the mass of Earth, it will pull objects slower. The only object that would fall faster on the moon than on earth is a sheet of paper since there is much, much less air resistance to affect its terminal velocity the way it does on the earth.
b. Lithium
c. Nitrogen
d. Magnesium
Answer:
Carbon monoxide is produced when combustion reactions are not fully completed,either through lack of oxygen or due to low mixing.
Carbon monoxide is a colorless and odorless gas.