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```        Q: Definition of grating element?
A: Elements are substances made up of solely one kind of atom . This mean that they comprised of atoms all with the same numbers of protons . The numbers of neutrons is , however , can differ within a component ; this situation is called isomerism .

Q: Diffraction grating problem please help?
A: firstly thing here is to is writing the formula of diffraction grating : dsin0=nR  R=wavelenth=landa , d= grating space   1 ) 2410 ( lines ) = 1/d you have n't got given info that - whether it 's 2410 lines per milimeter or centimetre . - cheak you issue - generally it 's say `` per millimetre '' - so i will go here with mm in this example .   to find d = 1/ 2410x10 3 -- -- -- 2410 's times by power of 3 since it is 2410 per mm ( converting to m )  gives = 4.14x 10-7 = d   i believed diffraction grating 're not required -- - because d = grating space - i got no truly convinced between these two terms !   ( 4.14x10-7 ) x ( sin16.3 ) = ( 3 ) x R ?   n = order number = 3   SIMPLY rearrange   R= wavelength = 3.8 x 10-8m   you mensioned give answering in nm so it would be 38nm   - AS LEVEL physcis student
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