If a student thinks that the calorimeter has tap water in it, but it actually contains salt water (which has a lower specific heat than tap water), then... A) the measured specific heat will be greater than the actual specific heat.

B) the measured specific heat will be less than the actual specific heat.

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

answer: d. objects on jupiter experience more gravity due to more gases