To calculate the decay rate of a known sample of particles

a) multiply the number of particles by the decay constant
b) divide the number of particles by the decay constant
c) multiply the number of particles by 2
d) divide the number of particles by 2

n = N e^kt

dn/dt = rate = (k) N e^kt so a)

The correct option to calculate the decay rate of a known sample of particles is:

a) multiply the number of particles by the decay constant

The correct way to calculate the decay rate of a known sample of particles is by multiplying the number of particles by the decay constant.

The decay constant is a measure of how quickly the particles in the sample decay over time. It is a characteristic property of the material being studied.

To calculate the decay rate, you need to have the number of particles in the sample and the decay constant. Multiply these two values together to obtain the decay rate.

Therefore, the correct option is (a): multiply the number of particles by the decay constant.