10- modelling decay

Question 1

Equation for half life?

Answer 1

T0.5 =ln2/λ

Question 2

Equation linking Number of nuclei remaining to starting umber?

Answer 2

N= N0 *e^-λt

Question 3

Define exponential change.

Answer 3

When the rate of change of a quantity is proportional to the value of the quantity.

Question 5

What is a capacitor?

Answer 5

An electrical component used to keep charge separated usually consisting of a pair of electrical conductors separated by a thin layer of insulator.

Question 6

Equation for capacitance?
Units?

Answer 6

C=Q/V
Measured in farads.

Question 7

Define capacitance?

Answer 7

The charge separated per volt for a capacitor.

Question 8

Energy stored in a capacitor?

Answer 8

0.5QV = 0.5CV^2

Question 9

Equation for a discharging capacitor?

Answer 9

Q= Q0*e^-t/RC
Same relationship for V and I

Question 10

What is the time constant?

Answer 10

The time taken for the charge on a capacitor to fall to 1/e if its original value.

Question 11

Equation for charging capacitor?

Answer 11

V=V0( 1- e^-t/RC )