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 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

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

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

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

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