An atom has 11 protons, 10 electrons and 13 neutrons. Is this a cation or an anion? a. An anion because the overall charge is -1.
b. A cation because the overall charge is +3.
c. A cation because the net charge is +1.
d. An anion because the overall charge is -2.

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

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