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Microgravity: living on the International Space Station
Microgravity: living on the International Space Station

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5 Quantum energy levels

You probably won’t be surprised to know that there is an equation for energy levels! Equation 2 is used to calculate the energy of a certain level (En) when you know the energy level (n). This n can take any integer value, that is 1, 2, etc.

equation left hand side cap e sub n equals right hand side negative 13.6 divided by n squared times e times normal cap v
Equation label: Equation 2

You should note the minus sign. It means that the electron is bound to an atom. You need to give it this amount of energy to release it. You can practise calculating energy levels in Activity 7.

Activity 7 Calculating energy values

Timing: Allow approximately 15 minutes

1. Using your calculator and Equation 2, calculate the energy value when n = 1. Then choose the correct option below.

a. 

–1.51 eV


b. 

–3.4 eV


c. 

–13.6 eV


d. 

–27.2 eV


e. 

13.6 eV


The correct answer is c.

2. Using your calculator and Equation 2, calculate the value of energy when n = 2. Then choose the correct option below.

a. 

–1.51 eV


b. 

–3.4 eV


c. 

–13.6 eV


d. 

–27.2 eV


e. 

13.6 eV


The correct answer is b.

3. Using your calculator and Equation 2, calculate the value of energy when n = 3. Then choose the correct option below.

a. 

–1.51 eV


b. 

–3.4 eV


c. 

–13.6 eV


d. 

–27.2 eV


e. 

13.6 eV


The correct answer is a.

You will now look at probably the most famous experiment in physics: the double slit experiment.