The speed of light is , but it still takes time for light to get to its destination. this is not usually a noticeable effect over short distances here on the earth, but as objects get farther away, the "lag time" for information becomes more . we see objects not as , but rather we see them as . for farther objects, this "lookback time" becomes . since extremely distant objects will also look incredibly to us, we need very large telescopes, which can gather and focus enough light to observe such objects.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

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

it would stay the same

um if your asking how to beat a level then that i can with that and how to fix your wii but other than that i can't u