(1 mark)
(b) the student read that the extension of the spring is proportional to the weight added'.
based on this idea, what would be the expected extension for a weight of 30 n?
(1 mark)

1 - wave length

2 - amplitude

3 - crest

4 - trough

explanation:

duh.

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m