1. Which type of electromagnetic radiation has the longest wavelength? A ultraviolet Bvisble. C x-ray. Dinfrared. Eradio.
2. Which kind of photon has the highest energy? Aa ultraviolet. B visible. Cx-ray. Dinfrared. Eradio.
3. An astronomer finds that the spectrum of a mysterious object shows bright emission lines. What can she conclude about the source? A It contains cold gas. B It is an incandescent solid body. C It is rotating very fast.. D It contains hot, relatively tenuous gas. E It is moving toward Earth at high speed.
4. A star's radiation is brightest at a wavelength of 450 nanometers. Its temperature is about A 4500 K. B 15000 K C 1500 K D 700 K E 7000 K
5. If an object's spectral lines are shifted to longer wavelengths, the object is A moving away from us. B moving toward us. C very hot. D very cold. E emitting x-rays.
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