Suppose a luminous cloud of gas is discovered emitting an emission spectrum. What can be learned about the cloud from this observation

hi there if you are asking for conformation that wavelingth is the correct answer is wrong it is the answer is frequency. : )

i hope this you out, have a wonderful day

where’s the list ? the question is incomplete

the closer the planet is to the sun, the larger the gravity

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.