What do the positive helium ions do for the e / m apparatus? choose the most complete, best answer.

a. they are there only when the electrons are not orbiting, otherwise, they move to the outer edge of the bulb.

b. they are there so that the bulb does not implode.

c. they emit photons which allow the beam to be seen.

d. they get hot and glow.

e. they focus the electron beam.

f. they focus the electron beam and they emit photons which allow the beam to be seen.

2. when is a charge acted upon by a magnetic force?

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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pe = weightxheight = 2000x1000=2,000,000joules

which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods