7.1 Study the diagram below and answer the questions that follow - NSC Technical Sciences - Question 7 - 2021 - Paper 1
Question 7
7.1 Study the diagram below and answer the questions that follow.
7.1.1 Define the term dispersion of light.
7.1.2 Identify the colours represented by numbers 3 an... show full transcript
Worked Solution & Example Answer:7.1 Study the diagram below and answer the questions that follow - NSC Technical Sciences - Question 7 - 2021 - Paper 1
Step 1
Define the term dispersion of light.
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Answer
Dispersion of light refers to the phenomenon whereby white light breaks up (spreads out) into its component colors. This occurs because different colors of light have different wavelengths and refract by different amounts when passing through a prism.
Step 2
Identify the colours represented by numbers 3 and 6. Write down the correct colour next to the numbers in your ANSWER BOOK.
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Answer
The colour represented by number 3 is yellow, and the colour represented by number 6 is indigo.
Step 3
Which wave property of light is responsible for the dispersion?
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Answer
The wave property responsible for the dispersion of light is refraction.
Step 4
State the relationship between the wavelength and the speed of a light wave.
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Answer
The relationship between the wavelength and the speed of a light wave is that when the wavelength increases, the speed of the wave also increases. Wavelength is directly proportional to the speed of the wave.
Step 5
Define a wave.
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A wave is a succession or repetition of pulses that transfer energy from one location to another without the physical transfer of matter.
Step 6
Name TWO characteristics of electromagnetic waves.
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Answer
They can propagate in a vacuum.
They travel at the speed of light in a vacuum (approximately 3imes108extm/s).
Step 7
Arrange the waves in the diagram above from the lowest to the highest frequency.
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Answer
The arrangement of electromagnetic waves from the lowest frequency to the highest frequency is:
