Physics · Oct / Nov 2019 · Paper 11 · Question 39

The diagram shows the trace on an oscilloscope screen when connected to a d.c. supply which is being switched on and off. The settings of the Y-gain control and the time base control are shown. The voltage of the supply is v. The supply is switched on f times per second. What are the values of v and of f?

1. Av = 2, f = 50
2. Bv = 2, f = 100
3. Cv = 4, f = 50
4. Dv = 4, f = 100

As printed in the paper