Question

1) What is the effect of pressure on velocity of sound????
2) How are microwaves produced? State their properties and uses.​

Answer 1

Answer:

1) At a constant temperature, the gas pressure has no effect on the speed of sound, since the density will increase, and since pressure and density (also proportional to pressure) have equal but opposite effects on the speed of sound, and the two contributions cancel out exactly.

2) Microwaves are generated by vacuum tubes devices. ... There are few examples of microwave emitters like cavity magnetron, the klystron, the travelling-wave tube(TWT), and many more. These instruments work based on clumps of electrons flying ballistically through them, instead of using a constant flow of electrons.