Answer:
The correct option is;
a. 12.5 g
Explanation:
The given parameters are;
The initial mass of the radioactive substance = 200 g
The half life of the radioactive substance = 50 years
The time duration for the disintegration = 200 years
The formula for half life is given as follows;
Where:
N(t) = Quantity of the remaining substance
N₀ = Initial radioactive substance quantity = 200 g
t = Time duration = 200 years
= Half life of the radioactive substance 50 years
Therefore, we have;
Therefore, at the end of 200 years, the quantity left = 12.5 g.
Answer:
The first one is the only one that is true all the time
Explanation:
The second one may be true if friction is high enough.
The other three are false all the time
almost everything artafitial would have been made because of science. However nothing natural would exist because of science. All science does is look around and see what's up.
You are asked to give the answer in <span>g/cm3. So without knowing any single formulae you can just divide grams by cm3.
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= 4.5 g/cm3
Answer:
The frequency of wave is 160Hz.
Explanation:
Given that the formula of speed is V = f×λ where V represents speed, f is frequency and λ is wavelength.
So first thing, you have to make frequency the subject by dividing wavelength on both sides :
Next you have to substitute the value of v and f into the formula :
Let λ = 2.5m,
Let v = 400m/s,
