2.3 Waves, Sound and Light Energy Review

Which diagram correctly compares the colors on the electromagnetic spectrum according to their wavelengths?

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Which statement best describes what the picture above shows?

• It shows white light being transformed into energy as it passes through ice.

• It shows heat being transformed into a visible spectrum with the use of a mirror.

• It shows how a visible spectrum can be transformed into white light through glass.

• It shows white light passing through a prism and separating into a visible spectrum.

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Hector discovered that one source of energy is unlimited. It is the major source of energy for life on earth. What is it?

• wind

• water

• the sun

• biomass

We spend our lives in visible light without risks to our health. Yet exposure to UV waves in sunlight can cause skin cancer.

What is the BEST explanation for this?

• UV waves are longer and carry more energy.

• UV waves are higher frequency and carry more energy.

• UV waves have a lower frequency and carry more energy.

• UV waves travel faster than visible light and have more energy.

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Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. UV radiation is called ultraviolet because it has a frequency which is higher than violet radiation (purple light). Therefore, it has a wavelength which is (a)   than violet radiation.

Based on your knowledge of the properties of light, what is the best explanation for the blue color of the ocean?

• The ocean absorbs blue light from the sky.

• Algae in the ocean absorbs red, orange and yellow light for photosynthesis.

• Although sunlight is described as white light, it actually has more blue components which becomes apparent when it strikes a clear medium like water.

• When white light from the sun strikes the ocean's surface, the elements of the visible spectrum with longer wavelengths are absorbed more than those with short wavelengths.

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If you put a straw into a glass of water, the straw looks to be bent, although nothing has really happened to the straw. The term that describes this property of light is

• absorption.

• diffraction.

• reflection.

• refraction.

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Why does light behave as shown in the image when it passes from air to glass?

• Light is scattered on the surface of the glass.

• Light slows down when it passes into a denser medium.

• Light is partially reflected on the surface of the glass.

• Light splits into its constituent colors when it passes through glass.

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You see an image of yourself in a mirror because light waves are

• diffracted.

• reflected back at you.

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Examine the model here. Which statements about the behavior of light shown in the model are supported by the image? Select ALL that apply.

• Red light is reflected by the material.

• Blue light is absorbed by the material.

• Red light is refracted by the material.

• Green light is absorbed by the material.

• Blue and green light have less energy than red light.

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