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1st - how to calculate frequency using the time base and a length? eg:- time base 2ms/cm length 5.4 cm, whats the frequency?

2nd - if y cm is the wavelength and Y-amplitude is a x amplitude how do i work out Vmax in volts? eg:- ycm = 5.6, Y-amplidude volt/cm = 5, what is Vmax volts?

3rd - what is the time base?

4th - how to work out the number of cycles using a graph?

Thankyou guys xxx