Earth's weather takes place in what layer of the atmosphere? a) exosphere b) lithosphere c) stratosphere d) troposphere

What does si stand for,when referring to a system of measurement

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.

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?