If x-rays excite a 2s electron from an atom, this corresponds to which of the following excited atomic states?

(a) K
(b) L
(c) M
(d) N

(b) L

Physics & Space Science

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The Sun converts mass to energy through the proton-proton chain.

Answer the following statement true (T) or false (F)

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Physics & Space Science

Determine the charge on each balloon using the electroscope when it has been charged positively. (Hint: Do the leaves spread farther apart or collapse when the charged object is brought near the electroscope knob?)

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Physics & Space Science

One major difference between Young's double slit interference experiment with light and Jonsson's similar experiment with electrons is that

A. the electrons exhibited an interference pattern only characteristic of particles and the light exhibited an interference pattern only characteristic of waves. B. the light must be at low intensity to produce the interference pattern while the electrons could be propelled onto the slits at very high frequency and still produce the pattern. C.the wavelengths of the electrons were much smaller than that of light and therefore the slits for the electron experiment were much more difficult to produce. D. For the electrons, the slit widths could be larger than for those of photons because of the electrons' larger momenta.

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Physics & Space Science

The Earth has a radius of about 6000 km. How long would it take for an object traveling at the speed of light to circle the Earth? (Recall that the speed of light is 300,000 km/s.)

A) 1/300,000 of a second (0.0000033 s) B) 1/6000 of a second (0.000017 s) C) 1/8 of a second (0.0125 s) D) 1/2 of a second (0.5 s)

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Physics & Space Science