Asilt fence is shown in the picture. a silt fence operates by intercepting and filtering sediment-laden runoff. it allows the sediment in the water time to settle before the water flows into other areas. the silt fence is also protecting against

a) erosion.
b) acid rain.
c) radiation.
d) weathering.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Which of these is constant for all types of electromagnetic radiation in a vacuum? select one: a. wavelength b. frequency c. photon energy d. amplitude e. velocity