[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.

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.

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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