Answer:
Pressure (P) is the amount of force applied perpendicular to the surface of an object per unit area. The SI unit of pressure is the pascal (Pa), which is equivalent to N/
(newtons per meter squared).
Water is capable of dissolving a variety of different substances, and is attracted to many other different molecules
Fundamental frequency is the "base frequency" upon which the sound is built.
Well, there aren't actually ANY that apply, because you haven't listed any. But I've lived a long time, and I remember hearing about electromagnetic waves and things that use them, so I can list a FEW of them for you:
-- radios
-- TVs
-- garage-door openers
-- TV remotes
-- cell phones
-- smart phones
-- GPS
-- walkie-talkies
-- car headlights
-- lava lamps
-- toasters
-- LEDs
-- light bulbs
-- fluorescent light tubes
-- police radios
-- Doppler weather radars
-- CB radios
-- ham radios
-- neon signs
-- eyeglasses
-- microscopes
-- telescopes
-- gas stoves
-- electric stoves
-- wood stoves
-- microwave ovens
-- tanning beds
-- cameras
-- lasers
-- CD recorders and players
-- DVD recorders and players
-- Bluray recorders and players
-- movie cameras
-- movie projectors
-- reading lamps
-- candles
-- whale-oil lamps
-- kerosene lanterns
-- flashlights
-- campfires
-- coffee percolators
-- heat lamps
-- cordless phones
These are just the ones I can think of right now off the top of my head. There are a lot of others.
Frequency is inversely proportional to wavelength.
Wavelength is the spacial period, and more generally the frequency is inversely proportional to the period.
If the wave's speed if c, then f=c/l where l is the wavelength.
