Unit 1 Review

What is the main difference between the colors of the visual spectrum?

• They all have different wavelengths.

• The brightness of the color is different.

• They all provided different amounts of heat.

• The all travel at different speeds.

Answer explanation

View the picture provided. The main difference between each color is they all have different wavelengths. RED has the longest wavelength and VIOLET has the shortest.

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Which of the following represents a wavelength?

• Point A to Point B

• Point E to Point F

• Point B to Point H

• Point C to Point H

Answer explanation

A wavelength is from crest to crest.

Remember crest = top of the wave.

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What does point A represent in the photo provided?

• Crest

• Trough

• Wavelength

• Amplitude

Answer explanation

Remember the following:

Crest = top of the wave

Trough = bottom of the wave

Wavelength = distance from one crest to another

Amplitude = height of the wave

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The following chart shows the amount of 3 different products ordered from Jan to June. Which month the product 1 grow the most?

• April to May

• Jan to Feb

• March to April

• Feb to March

Answer explanation

Remember you were looking for which month did ONE of the data points grow the most!

Which of the following has waves from the EM spectrum correctly ordered from SHORTEST to LONGEST wavelength?

• Infrared, Microwaves, Radio waves

• Radio waves, Microwaves, Infrared

• Radio waves, Infrared, Microwaves

• Infrared, Radio waves, Microwaves,

Answer explanation

View the image provided. To remember the order of the EM Spectrum from longest to shortest wavelength you can use "Raging Martians Invaded Venus Using X-ray Guns."

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Why do some apples appear red?

• Because they are ripe
• Because they absorb all colors except red, red is reflected.

• Because they reflect all colors except red, red is absorbed.

• Because they are genetically modified

Answer explanation

See the picture provided. RED is being reflected. All the other colors are being absorbed.

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What is the dependent (outcome) variable in the following experiment?

A group of students are investigating if the amount of sunlight affects a plant's height. The students grow plants in several different amounts of light and then measure their height. All the plants receive the same amount of water and no fertilizer.

• Amount of sunlight
• Height of the plants
• Amount of water
• Use of fertilizer

Answer explanation

INDEPENDENT VARIABLE = what you are changing in your experiment.

DEPENDENT VARIABLE = what you are measuring (your data) in your experiment.

What is the independent variable in the following experiment?

A group of students are investigating if the amount of sunlight affects a plant's height. The students grow plants in several different amounts of light and then measure their height. All the plants receive the same amount of water and no fertilizer.

• Amount of sunlight
• Height of the plants
• Amount of water
• Use of fertilizer

Answer explanation

INDEPENDENT VARIABLE = what you are changing in your experiment.

DEPENDENT VARIABLE = what you are measuring (your data) in your experiment.

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How does infrared light differ from microwave and radio light waves?

• Infrared light has a shorter wavelength and higher frequency than microwave and radio light waves.
• Infrared light has a longer wavelength and lower frequency than microwave and radio light waves.

• Infrared light is visible to humans while microwaves and radio waves are not.

• Infrared light, microwave, and radio light waves all have the same wavelength and frequency.

Answer explanation

View the picture provided. Find infrared. What do you notice about the wavelength from infrared light to radio waves. You should see that the wavelength gets longer and the frequency gest lower.

Remember frequency = the number of waves; wavelength = the distance between the waves.

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What can we use to separate the different colors of light.

• Prism
• Mirror
• Lens
• Triangle

Answer explanation

View the picture provided. Remember the prism that I showed you in class!

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