The diagram shows waves of sound travelling through the air. An illustration of a point labeled sound source with concentric circles spreading out from it. Every other circle is 1 more meter away from the source. The sound source is 270 decibels.
By which factor is the sound intensity decreased at 3 meters?

StartFraction 1 over 9 EndFraction.
StartFraction 1 over 3 EndFraction.
StartFraction 1 over 2 EndFraction.
StartFraction 1 over 4 EndFraction.

Shy diving is the only sport which doesnot require a high level of physical fitness

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

The best answer i can think of is b

Answerit decreases;