Pre-service teachers’ (PSTs’) difficulties about stop voltage.
Item | Difficulties | Number |
---|---|---|
5 | The stopping voltage prevents photoelectrons from being emitted from the surface of the metal plate. | 4 |
5 | PSTs don't know what the stop voltage is. | 2 |
11 | PSTs do not interpret the meaning of negative numbers in the voltage-photocurrent graph. | 3 |
13 | The stopping voltage serves to emit photoelectrons. | 1 |