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What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?
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Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?
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Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.
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A 5-inch, f/10 telescope has a 2-inch eyepiece focal. Its magnifying power is:
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