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Table. 6.

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
New Phys.: Sae Mulli 2022;72:841~856