[Catalist] UV light and Laser for Y12 Physics?

[Leon Harris]

Hi Fiona,
I am surprised with the hair width experiment. The bog-standard 650nm 
cheapie lasers work well in my experience. I bought a $3 chinese 1mW module.

You wont get all that much joy with the uv leds/lasers - they run around 
405nm, which is 3.06 ev, you need over 4 for aluminium!
Best bet is a uv fluoro tube, you can get them for under $10 on ebay for 
the note and stamp collectors.

I've have a copy of a great demo, published in The Physics Teacher, of 
how to do a great demo of photoelectric effect with a tin can, streamers 
etc.
Sadly I can't post attachments to this list, so flick me an email if you 
want it, or are you just after sources of materials at this stage.

sigh...back to marking.

Cheers,
Leon

On 9/06/2016 3:11 PM, KERRELL-VAUGHAN Fiona [Cape Naturaliste College] 
wrote:
>
> Hi, we have been trying to find a UV light which convincingly 
> demonstrates the Photo electric effect; the ones we have tried give an 
> unimpressive effect on an electroscope, but we would like something 
> with a bit more 'oomph'...
>
> We have also been unable to create good interference patterns to 
> measure the width of a hair with the 'toy' lasers available...
>
> If any one could send the spec of the best UV/lasers to use, or the 
> closely guarded secret to success with these practicals, I would be 
> very grateful.
>
> Thanks & regards,
>
> *Fiona Kerrell-Vaughan*
>
> ////
>
> **/Science Teacher/**
>
> **Cape****Naturaliste College**
>
> 30 Vasse Yallingup Siding Road
>
> VASSE  WA  6280
>
> Ph:   9750 2600
>
> Fax:  9750 2650
>
>
>
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