I don’t see any equal signs to make it an equation. Am I missing something?
Answer:
THE HALF LIFE OF THE RADIOACTIVE PHOSPHORUS-32 IS 1.15 DAYS.
Explanation:
Half life is the time required for half of a given sample of a radioactive substance to decay. It is represented as t1/2.
Nt = No e^-yt
Nt = 27.7 %
No = 100%
t = 26.5 days
y = decay constant
t1/2 = half life = unknown
So therefore,we solve for the decay constant and then using the formula Half life = Ln 2/ decay constant, we solve for the half life.
Nt = No e^-yt
27.7 = 100 e ^-26.5 y
0.277 = e^-26.5 y
Take the natural log of both sides
Ln 0.277 = -26.5 y
y = Ln 0.277/ -26.5
y =-1.2837/ -26.5
y =4.84 *10 ^-2
Since half life = Ln 2 / y
Half life = ln 2 / 4.84*10-2
Half life = 1.1456 days.
Hence, the half life for the radioactive phosphorus -32 is 1.15 days.
Atomic radius
Explanation:
A decrease in moving from the bottom of Group 3 to the top of the group shows an increase in trend from top to bottom.
The atomic radius of elements increases from top to bottom and decreases from the bottom to the top.
The elements in group 3 are B, Al , Ga, In and Tl
- Atomic radius is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state of metals.
- Downs a group from top to bottom, atomic radii increases progressively due to successive shells being added.
- This compensates for the size reducing effect of the increased nuclear charge.
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Answer:
C.
Explanation:
Specific heat capacity of a substance can be defined as the amount of heat a gram of the substance must lose or absorb in order to change its temperature by a degree Celsius. It is measured in Joules per kilogram per degree Celsius (J/kg°C).
Generally, the specific heat capacity of water is 4.182J/kg°C and is the highest among liquids.
Heat capacity or quantity of heat is given by the formula;
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of the substance.
dt represents the change in temperature.
Hence in calculating the relationship between the amount of heat added to a substance and the corresponding temperature change, the specific heat capacity is usually represented by the symbol C.