Unit 3 Test

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

• Radius

• Mass

• Magnetic Field

• Temperature

• Direction of motion

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The visible color of electromagnetic radiation (that is listed below) that has the shortest wavelength is

• Red

• Orange

• Green

• Yellow

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Electromagnetic radiation with a wavelength of 330 nm would be:

• x-rays

• red light

• blue light

• Uv light

• green

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The temperature scale used in this unit

• Celsius

• Farenheit

• Centigrade

• Kelvin

• Ransom

The number of waves passing an observer per second is:

• he wavelength in angstroms.

• the amplitude in nm.

• the frequency in Hz.

• the period in seconds.

• he energy in milliwatts.

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

• Infrared

• Gamme

• X-ray

• Visible

• Uv

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

• Radio

• Microwave

• Gamme

• X-ray

• UV

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Which of the following type of electromagnetic radiation has the highest frequency?

• Infrared

• Visible

• Uv

• X-ray

• Radio

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A hydrogen light (thin hot gas in a sealed tube) gives us:

• a continuous spectrum, since hydrogen is hot enough to glow.

• a few bright emission lines, telling us the gas is hydrogen.

• a continuum, with dark lines identifying the neon atoms are present.

• a lot of random bright red and blue lines due to the motion of the hot atoms.

• nothing visible to us, but a hot of infrared lines as heat.

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There are no radio telescopes in space because

• no one has built an antenna large enough to reach astronomical objects yet

• radio telescopes are too fragile and expensive to make to put into space

• there is too much radio noise in space, so a radio telescope won't work out there

• radio waves penetrate Earth's atmosphere so there is no need to put one in space

• you need an array, like the VLA to detect ANY radio radiation, so it is just not realistic to put an entire array in space

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