Communication with submerged submarines via radio waves is difficult because seawater is conductive and absorbs electromagnetic waves. penetration into the ocean is greater at longer wavelengths, so the united states has radio installations that transmit at 76 hz for submarine communications. what is the approximate wavelength of those extremely low-frequency waves?

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s. part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Diverging mirrors and lenses always produce images

Asemipermeable membrane is placed between the following solutions. which solution will decrease in volume? solution a: 1.4% (m/v) starch solution b: 7.62% (m/v) starch