Unit 8: Electromagnetic Radiation

Electromagnetic waves vary in

•  the speed they travel in a vacuum.

• wavelength and frequency.

• the way they reflect.

• their direction.

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Light acts like

•  a wave.

• a particle.

• both a wave and a particle.

• neither a wave nor a particle.

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Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light

•  is radiation.

• is a wave.

•  is a stream of particles.

• is heat.

Infrared rays have a shorter wavelength than

• ultraviolet waves.

• radar waves.

•  x-rays.

• gamma rays.

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The full range of frequencies of electromagnetic radiation is called

• visible light.

• the electromagnetic spectrum.

• radio waves.

• invisible radiation.

The waves with the longest wavelengths in the spectrum are

• infrared waves.

•  gamma rays.

• radio waves.

•  x-rays.

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A translucent material

• reflects all light.

•  transmits all light.

• absorbs all light.

•  scatters some light.

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Place the following materials in order of least light-transmitting to most light transmitting.

• transparent

• opaque

• translucent

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Which of the following occurs as a light wave bends when it passes from one medium into another?

• reflection

• destructive interference.

• refraction

•  constructive interference

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Newton’s prism experiments showed that white sunlight is made up of

• only blue light when separated by a prism.

• only the longest wavelengths.

• all the colors of the visible spectrum.

• the full electromagnetic spectrum.