Question

Please help :/

Answer 1

http://screencast.com/t/QK9hNKdKdA

Answer 2

What is the (b) part showing?

Answer 3

http://screencast.com/t/JKCHEKbB8tAs

Answer 4

there will be some dark lines in the absorption spectrum ,that is some wavelengths will be absorbed by the hydrogen gas and corresponding dark lines will appear for those wavelength , as hydrogen can absorb wavelength of 654nm and 488 nm only , these wavelengths will be absent from the emergent light

http://csep10.phys.utk.edu/astr162/lect/light/absorption.html if you wish to read some more