Answer:
33 degrees
Explanation:
The critical angle for a light ray moving from a denser medium with refractive index to a second medium with refractive index
is given by
In this case, the critical angle occurs when light moves from diamond to water. The index of refraction of the two materials are:
for diamond
for water
So the critical angle is
<u>Answer:</u> The moles of NaOH are 0.25 moles.
<u>Explanation:</u>
To calculate the number of moles, we use the following formula:
Calculations for the moles of NaOH:
Given mass of NaOH = 10 g
Molar mass of NaOH = 40 g/mol
Putting values in above equation, we get:
Hence, the moles of NaOH are 0.25 moles.
Answer: The tree died 9709.46 years before.
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant = 100
a - x = amount left after decay process =
a) to find rate constant
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
b) to know the age
The tree died 9709.46 years before.