When pore spaces become completely filled with water, the soil is considered to be at
What will be an ideal response?
Field Capacity
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Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness extremely rapidly as they rotate on their axes. B) Cepheid variables are stars that brighten and dim with a period that is directly related to the star's luminosity. C) Cepheids are a type of young galaxy that helps us understand how galaxies form. D) Cepheids are supermassive stars that we observe because they will soon undergo supernovae.
The Balmer series of emission lines from hydrogen lie in the ________ part of the EM spectrum
a. near infrared b. infrared c. visible d. ultraviolet
The phenomenon of interference is the result of:
1.conservation of energy 2.superposition 3.the Fourier theorem 4.conservation of mass 5.all of the above
The total kinetic plus potential energy of a body
a. can be negative b. always stays constant if the body is freely falling c. always stays constant if friction is acting d. can remain constant even if the body's speed is decreasing