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A helium atom is in a galaxy travelling at a speed of 4.89 x 106 m/s away from the Earth.
An astronomer on Earth observes a frequency from the helium atom of 6.52 x 1014 Hz.
What frequency of light is emitted from the helium atom?
COHERENCE : 1) Visible light energy is emitted when the excited electrons in atoms undergo transitions to the ground state. 2) In ordinary light sources, these transitions
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How theta between plane of the coil and magnetic field remains constant
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