x Turn on thread page Beta
 You are Here: Home >< Physics

# how to calculate planck's constant? watch

1. 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
2. (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
I think the gradient of your graph should be very small since the frequency of the emitted radiation is quite large on average.

Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: November 10, 2015
Today on TSR

### How much will your degree earn you?

Find out where yours ranks...

Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE