Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

how to calculate planck's constant?

I have plotted a graph of the sopping potential (Vs) against Frequency. We were asked to calculate Planck's constant from this graph. I thought as the equation for this graph is Vs=h/e F-Φ/e, the gradient is h/e, so I can find h, Planck's constant by multiplying my gradient by the charge on an electron. However my gradient is 0.43 so I don't get Planck's constant that way. Anyone see where/if I'm going wrong? thanks in advance :smile:

:smile:

Original post by colback98

I have plotted a graph of the sopping potential (Vs) against Frequency. We were asked to calculate Planck's constant from this graph. I thought as the equation for this graph is Vs=h/e F-Φ/e, the gradient is h/e, so I can find h, Planck's constant by multiplying my gradient by the charge on an electron. However my gradient is 0.43 so I don't get Planck's constant that way. Anyone see where/if I'm going wrong? thanks in advance :smile:

:smile:

I think the gradient of your graph should be very small since the frequency of the emitted radiation is quite large on average.

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