Slides in this set
1. Connect an LED of known wavelength in the
electrical circuit shown.
2. Start off with no current flowing through
the circuit, then adjust the variable resistor
until a current begins to flow.
3. Record the voltage (V0) across the LED & the
wavelength of light being emitted.
4. Repeat with LEDs of different wavelengths.
5. Plot a graph of V0 against 1/.
6. You should get a straight line with a
gradient hc/e. Use this to find h.…read more
Experiments show that:
1. Increasing intensity increased number of
2. For a light below a certain threshold
frequency, no electrons are emitted.
3. The maximum kinetic energy of the
photoelectrons increases with frequency,
but is unaffected by the intensity.…read more