Like how am i supposed to know if a certain colour has a greater wavelength than another colour, like wavelength of red > wavelength of white?
First of all, white light doesn't have a wavelength, it's a combination of all the wavelengths of visible light. Secondly, you just have to learn it. Memorise this diagram:
First of all, white light doesn't have a wavelength, it's a combination of all the wavelengths of visible light. Secondly, you just have to learn it. Memorise this diagram:
Okay ill learn that diagram thanks! So therefore according to that the wavelength of blue> wavelength of red & the wavelength of any colour> wavelength of white?
Okay ill learn that diagram thanks! So therefore according to that the wavelength of blue> wavelength of red & the wavelength of any colour> wavelength of white?
No the wavelength of red (~700nm) is longer than the wavelength of blue (~450nm). White light doesn't have a wavelength, the whole point is that it's a combination of different wavelengths of light. It makes no sense to say that something has a longer wavelength than white light because white light doesn't have a wavelength, it's a continuum of wavelengths.
Okay ill learn that diagram thanks! So therefore according to that the wavelength of blue> wavelength of red & the wavelength of any colour> wavelength of white?
Small wavelengths are at the top of the diagram. An angstrom is smaller than a kilometre.
No the wavelength of red (~700nm) is longer than the wavelength of blue (~450nm). White light doesn't have a wavelength, the whole point is that it's a combination of different wavelengths of light. It makes no sense to say that something has a longer wavelength than white light because white light doesn't have a wavelength, it's a continuum of wavelengths.
That's the average wavelength of the white light. If the mark scheme was talking about the wavelength of the white light then it wouldn't make sense because there are infinitely many different wavelengths for the white light. White light has a continuous distribution of wavelengths, but you can still take the average of them(in every case as far as I know). If you've studied calculus then if the allowed values of λ in the white light are in I then λˉ=∫IP(λ)dλ∫IλP(λ)dλ. If not then imagine taking the mean of a finite number of (weighted) values then extending this to infinitely many.
That's the average wavelength of the white light. If the mark scheme was talking about the wavelength of the white light then it wouldn't make sense because there are infinitely many different wavelengths for the white light. White light has a continuous distribution of wavelengths, but you can still take the average of them(in every case as far as I know). If you've studied calculus then if the allowed values of λ in the white light are in I then λˉ=∫IP(λ)dλ∫IλP(λ)dλ. If not then imagine taking the mean of a finite number of (weighted) values then extending this to infinitely many.
I have studied calculus but that does look difficult haha Okay so what is the wavelength of average white?
It says average... red is at one of the extreme ends of the visible spectrum the middle of a fringe made with white light would be in a different place to the middle of a fringe made with red light.
fwiw A couple of mnemonics for the order of colours by decreasing wavelength
Richard Of York Gave Battle In Vain Rock On You Great Big Indian Vole
It says average... red is at one of the extreme ends of the visible spectrum the middle of a fringe made with white light would be in a different place to the middle of a fringe made with red light.
fwiw A couple of mnemonics for the order of colours by decreasing wavelength
Richard Of York Gave Battle In Vain Rock On You Great Big Indian Vole
It says average... red is at one of the extreme ends of the visible spectrum the middle of a fringe made with white light would be in a different place to the middle of a fringe made with red light.
fwiw A couple of mnemonics for the order of colours by decreasing wavelength
Richard Of York Gave Battle In Vain Rock On You Great Big Indian Vole
By decreasing wavelength you mean wavelength of red is greater than wavelength of blue?