Group Review Unit 3

According to Wein's Law, the peak wavelength at which a blackbody radiates most depends on its

• Radius

• Temperature

• Direction of motion

• Mass

• Magnetic Field

What is true of blackbody radiation?

• It appears black to us, regardless of its temperature.

• Its energy is not a continuum.

• The distribution of the wavelengths emitted has a peak wavelength but also emits across a wide spectrum

• If its temperature doubled, the peak in its curve would be doubled in wavelength.

• It has a complete absence of thermal energy.

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Electromagnetic radiation with a wavelength of 550 nm would be:

• X-ray

• Violet

• Orange

• Red

• Green

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Which of these is constant for ALL types of electromagnetic radiation in a vacuum (when air is not present)?

• Amplitude

• Wavelength

• Velocity

• Frequency

• Energy

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Which of the following type of electromagnetic radiation has the lowest energy?

• Gamma

• Infrared

• Visible

• UV

• X-ray

Stars like our Sun emit most of their light in visible spectrum. What spectrum would a significantly cooler star primarily emit in?

• Visible

• x-ray

• UV

• Radio

• Infrared

If a wave's frequency doubles, its wavelength

• is halved.

• is also doubled.

• is unchanged, as c is constant.

• is now 4× longer.

• becomes 16× longer.

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Colors appear different to us because of their photons' different:

• Frequency

• Wavelength

• Amplitude

• Magnetic field

• Velocity

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Which line represents the most amount of energy being absorbed?

• 1

• 2

• 3

• 4

• 5

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If transition #5 involves a (visible light) green photon, then which of the following is closest to the color of the photon associated with transition #4?

• Red

• Green

• Blue

• Violet

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