Interference occurs with not only light waves but also all frequencies of electromagnetic waves and all other types of waves, such as sound and water waves. suppose that your physics professor sets up two sound speakers in the front of your classroom and uses an electronic oscillator to produce sound waves of a single frequency. when she turns the oscillator on (take this to be its original setting), you and many students hear a loud tone while other students hear nothing.
the professor adjusts the oscillator to produce sound waves of twice the original frequency. what happens? (this is a multiple choice question)
a: the students who originally heard a loud tone now hear nothing, and the students who originally heard nothing now hear a loud tone.
b: the students who originally heard a loud tone again hear a loud tone, and the students who originally heard nothing still hear nothing.
c: among the students who originally heard nothing, some still hear nothing but others now hear a loud tone.
d: some of the students who originally heard a loud tone again hear a loud tone, but others in that group now hear nothing

no. dot product   =0 when vecs at right angles

not moving. pos accel,

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bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

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