The mass decay rate is of the form
where
m₀ = 3000 g,the initial mass
k = the decay constant
t = time, years.
Because the half-life is 30 years, therefore
After 60 years, the mass remaining is
Answer: 750 g
It is a graph. It shows observations and then you record your results with any of the graph types.
B. combination of all wavelengths of visible light