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a) Smoke detector- americiumb) As alpha radiation is not very penetrating

Using the SUVAT equation: v = u + at
v = ?u = 20a = 2t = 10
v = 40m/s

Use SUVAT for constant vertical acceleration. Solve for t. S = -10U = 0V = -A = -gT = tS=UT+(AT^2)/2t = sqrt(20/g)

Newton's 3rd law, simply put, is every action has an equal and opposite reaction. This means when you push on an object the object experiences a force (from you) and the object exerts an equal force...

In the classical model, light is a wave and it's energy depends on its intensity. This would predict electron emission at all wavelengths of light. So the model cannot explain the threshold frequenc...