Transverse waves is the answer.
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Answer:
The frequency heard y the ship is 70 MHz.
Explanation:
True frequency, f = 50 MHz
speed of source, vs = 0
speed of observer, vo = 0.4 c
Let the frequency heard by the ship is f'.
Use the formula of doppler's effect

It has 52 Protons and 73 Neutrons
the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.