Answer:
If instrument used has louder pitch and due to the fact that pitch depends on frequency we expect that the wave pattern on the graph would it's crest or trough contract more to represent higher frequency
Neutron is electrically neutral and is found in the nucleus of the atom
We use the equation of motion for vertical component,

Here,
is displacement of bullet,
is vertical initial velocity of bullet which is equal to zero because bullet was fired horizontally, and t is time of flight.
Therefore,

Given, 
Substituting the values, we get time of flight

Light rays travel parallel to each other, no image formed