[Physical Science] Spring Semester Exam Study Guide

Explain what type of wave is needed to cook food in a microwave oven.

• Electromagnetic waves because they have a high frequency.

• Surface waves because they splash the water in the food around.

• Electromagnetic waves because they have a low frequency.

• Light waves because the food cannot cook without light.

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Compare the amplitude and energy of the waves below.

• Wave A displays an increase in amplitude that is causing the energy of the wave to increase.

• Wave B displays an increase in amplitude that is causing the energy of the wave to increase.

• Wave A displays a decrease in amplitude, so it has less energy.

• Wave B displays a decrease in amplitude, so it has more energy.

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Why must x-ray technicians take special precautions that radio technicians do not have to take?

• X-rays have much longer wavelengths than radio waves, allowing them to transport more energy.

• X-rays have much shorter wavelengths than radio waves, allowing them to transport more energy.

• X-rays have much shorter wavelengths than radio waves, and are able to travel over and around more objects.

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The diagram below shows the different types of electromagnetic waves with their range of frequencies. Which explanation correctly compares the energy difference between X-rays and microwaves?

• Microwaves have more energy than X-rays because the energy of electromagnetic waves increases when their wavelength is longer, and microwaves have a longer wavelength than X-rays.

• X-rays have more energy than microwaves because the energy of electromagnetic waves increases when their frequency is greater, and X-rays have a greater frequency than microwaves.

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What action do sound waves take when they reflect after hitting the wall?

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Two waves are depicted on the graph. Each wave is labeled A-U. Compare the two waves shown in the graph. How are they similar and how are they different in terms of frequency and energy.

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Answer explanation

The waves are similar because they have about the same amount of energy, but wave A-E has less frequency than wave m-s because the peaks are farther a part.

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Explain the difference between an electromagnetic wave and a mechanical wave.

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Answer explanation

Mechanical waves require a medium in order to travel; electromagnetic waves can travel through empty space.

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A student measured four electromagnetic waves of different frequencies and wavelengths. Which electromagnetic wave has the most energy? Explain.

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Which of the following questions explains the type of wave which can travel at the speed of light?

• mechanical waves

• electromagnetic waves

• longitudinal waves

Answer explanation

1. Electromagnetic waves travel at the speed of light.

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What is the wavelength of the sine wave shown below?

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