(a) A satellite goes from a low circular Earth orbit to a higher circular Earth orbit. Does the satellites gravitational potential energy increase, decrease, or remain the same ?
(b) What is the most common cause of tinnitus (ringing in the ears) ?

Explanation

(a) Gravitational potential energy (GPE) of a statellite of mass `m` in an an orbit of radius `r` is given by (- GMm//r) where `M` is the mass of Earth. When the satellite goes to higher circular orbit, `r` increases, `(-GMm//r)` becomes less negative i.e. `GPE` becomes less negative i.e., it increase.
(b) Loud noise exposure.