AC current and incandescent bulbs

In my class we did an experiment where we measured the flicker frequency of an incandescent bulb and a CFL bulb (powered by a 60hz wall plug) using a photodiode and a oscilloscope. We were then asked some questions about the sinusoidal curves that were produced.

1. The incandescent bulb probably has a large "DC offset". Why do you think this is?
(im struggling with this question. Does it have something to do with the filament heating up?)

2. Is the flicker frequency for each of them the same as the 60hz wall plug frequency? why or why not?

From the experiment I found out that the frequencies were 120hz but I dont know why?

Please help
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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