Grating Spectrum

https://isaacphysics.org/questions/grating_spectrum?board=bc451da0-8813-49ff-ada6-c05ef4137ad1&stage=a_level

stuck on part c and d

for part c i did lambda = d*sin35.2 but its incorrect

for part d what values of lambda do i use to find out sin theta

Reply 1

Eimmanuel

Study Forum Helper

Original post by lottte

For part c, you need to determine the diffraction order for the yellow line at 35.2°.

For part d, if you don't know which value of wavelength to use, it would be good to evaluate the maximum angle for all the wavelengths and look for the pattern such that you can apply your understanding to future questions.