ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: Linkage1992 on November 09, 2010, 12:16:13 am

Title: More problems! This time from Lisachem 2008
Post by: Linkage1992 on November 09, 2010, 12:16:13 am

(http://i56.tinypic.com/149tb4m.jpg)

They say the answer is B, but since the minimum energy required to ejected electrons is half that of the sodium, wouldn't this imply that that the threshold frequency is also half, leading to C?


and for this:

(http://i51.tinypic.com/2qun8s4.jpg)

Answers say A is red, B is blue, but because red has a longer wavelength, the fringe spacing would be larger for it, so shouldn't it be the other way around?

Title: Re: More problems! This time from Lisachem 2008
Post by: Blakhitman on November 09, 2010, 12:20:19 am

I would also say that 5. is C because the |y-int| has to be less for silver than sodium right? :S

Title: Re: More problems! This time from Lisachem 2008
Post by: ghadz7 on November 09, 2010, 12:23:10 am

Quote from: Blakhitman on November 09, 2010, 12:20:19 am

I would also say that 5. is C because the |y-int| has to be less for silver than sodium right? :S

yep, y-intercept gives you W.

Title: Re: More problems! This time from Lisachem 2008
Post by: taiga on November 09, 2010, 12:24:59 am

I think this paper was riddled with errors!

Title: Re: More problems! This time from Lisachem 2008
Post by: Elnino_Gerrard on November 09, 2010, 01:02:51 pm

Q9 ure right i remeber doing this in class teacher said answer waz wrong.