Answer: the answer is radiation
Explanation: Radiation, because heat travels in all directions Convection, because heat travels in all directions Conduction, because heat travels from hot to cold Radiation, because heat travels from cold to hot.
The apparent change in the frequency of a sound caused by the motion of either The Listener or the source of the sound
The electrical charge is neutral. I hope this helps!
Answer:

Explanation:
As we know that the resultant of two vectors is given as

here we know that



now we have



Answer:
utrasonic
Explanation:
these are sounds beyond our hearing capacity range of 20-20kHz