On the surface of earth, a spacecraft has a mass of 2.00 x 10⁴ kilograms. what is the mass of the spacecraft at a distance of one earth radius above earth's surface?
(1) 5.00 × 10³ kg
(2) 2.00 × 10⁴ kg
(3) 4.90 × 10⁴ kg
(4) 1.96 × 10⁵ kg

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

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