What is the distance between the motion sensor and the object?
the motion sensor acts as a transmitter, when it sends out pulses, and as a receiver, when it listens for echoes. the delay t between sending a pulse and receiving the echo is equal to 8.8 ms (=0.0088 s). the air temperature id 20 degrees celsius.

1.5092 m

Explanation:

Time taken by the wave for the round trip is 8.8 ms

Velocity of sound at 20 degrees Celsius is 343 m/s

The distance to the object will be given by the one way trip

Time taken for one way trip is

Distance is given by

The distance between the motion sensor and the object is 1.5092 m

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.