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Light Wavelengths - HSN forum

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Light Wavelengths


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#1 Pammy

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Posted 16 May 2006 - 11:13 AM

I was reading a revision book and it says that I need to know the wavelengths of red, green and blue light for H Physics, but my teacher has never told me this.
Is it true ??

Thanx in advance
*~* Pam xxx *~*
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*

#2 Misbah

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Posted 16 May 2006 - 11:30 AM

hey pam!! no you do not need to know the exact values only that RED has the highest (ROYGBIV) so red has the highest and violet will have the smallest xxxxx hope this has helped!!

#3 Pammy

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Posted 16 May 2006 - 11:33 AM

Ahhh tht's ok then
Thankyou twinny!!
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#4 dfx

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Posted 16 May 2006 - 12:26 PM

It would help if you did. I've seen quite a few laser questions particularly where the wavelength of light is stated/calculated and then you have to decide what colour it is. Just learn rough values for the 3 e.g. ~700nm ~500nm etc. Unless things have changed with the new data book for physics?

#5 werlop

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Posted 16 May 2006 - 01:05 PM

QUOTE(dfx @ May 16 2006, 01:26 PM) View Post

It would help if you did. I've seen quite a few laser questions particularly where the wavelength of light is stated/calculated and then you have to decide what colour it is. Just learn rough values for the 3 e.g. ~700nm ~500nm etc. Unless things have changed with the new data book for physics?


Yeah, it's not really that hard to remember is it?
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#6 Pammy

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Posted 16 May 2006 - 01:21 PM

No but I was just wondering, no point in learning them if i don't need to
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*

#7 Pyrefly

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Posted 16 May 2006 - 01:57 PM

our teacher told us that it would be good to have a rough idea of the wavelengths for a red emission (there are many shades of red after all ;p) a green (somewhere in the middle) and a blue/violet (at the end)

Out study sheets give us the examples
Red : 700nm (7x10^-7m)
Green : 540nm (5.4x10^-7m)
Blue : 490nm (4.9x10^-7m)

different books give different values for these coulours due to the different shades...so we were told to learn those ones and therfore know red is around 700nm etc...

(if you cant make sence of that...best to ignore it)

#8 Pammy

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Posted 16 May 2006 - 02:02 PM

QUOTE(Pyrefly @ May 16 2006, 01:57 PM) View Post

our teacher told us that it would be good to have a rough idea of the wavelengths for a red emission (there are many shades of red after all ;p) a green (somewhere in the middle) and a blue/violet (at the end)

Out study sheets give us the examples
Red : 700nm (7x10^-7m)
Green : 540nm (5.4x10^-7m)
Blue : 490nm (4.9x10^-7m)

different books give different values for these coulours due to the different shades...so we were told to learn those ones and therfore know red is around 700nm etc...

(if you cant make sence of that...best to ignore it)



Ok i will learn those values that are on your study sheets, thanx
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*

#9 Misbah

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Posted 16 May 2006 - 02:28 PM

i shall learn them too

#10 Pammy

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Posted 16 May 2006 - 02:42 PM

QUOTE(Misbah @ May 16 2006, 02:28 PM) View Post

i shall learn them too


Haha I am glad u shall !!!
Pam xxxx
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*

#11 Michael

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Posted 16 May 2006 - 02:46 PM

The SQA materials give:

Red : 700nm (7x10^-7m)
Green : 540nm (5.4x10^-7m)
Blue : 490nm (4.9x10^-7m)

#12 Pammy

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Posted 16 May 2006 - 02:57 PM

QUOTE(Dhesi @ May 16 2006, 02:46 PM) View Post

The SQA materials give:

Red : 700nm (7x10^-7m)
Green : 540nm (5.4x10^-7m)
Blue : 490nm (4.9x10^-7m)



Ok that's good then, no need to learn !!!
Thankyou
Pam xxx
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*

#13 ice_illusion

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Posted 16 May 2006 - 03:09 PM

At the front of the exam we're given a data sheet. On it there is a table saying spectral lines. Theres element, then wavelengths and then it tells you the colour of each wavelength.





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