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Sound waves lab answers for grade 6 science (free PDF download)

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The method and the results are on the sound waves lab. Do the analysis yourself first, then check the answers below.

Quick answer: Sound is made by vibrations and travels through a medium such as air, water or steel, but not through a vacuum. These answers go with the grade 6 science lab on sound waves: the graph, the calculations, the uncertainties and the conclusion explained, for all 7 analysis questions.

Sound waves lab answers for grade 6 science (free PDF download)

Here are the sound waves lab answers for grade 6 science: graph, calculations, uncertainties and conclusion. First do the lab yourself, then compare, and go back to the lesson if needed.

The sample data show that the frequency rises as the air column gets shorter, and that the relationship is a curve, not a straight line. Compare your readings with these answers and explain any differences.

Level: Grade 6 science (Year 7 · Class 6) · Curriculum: MS-PS4-1

Sound waves lab answers: the analysis explained

Question 1 Pattern

The frequency increases as the air column gets shorter, so the pitch gets higher.

Question 2 Highest pitch

The shortest column, 4 cm, gave the highest pitch at 1750 Hz.

Question 3 Comparing two columns

960 ÷ 410 = 2.34, so the frequency is about 2.3 times greater.

Question 4 Graph

The graph is a curve that falls steeply and then flattens, so frequency is not proportional to length: it rises faster at short lengths.

Question 5 Prediction

Below 410 Hz, because a longer column gives a lower pitch, so the frequency would be lower than 410 Hz (about 350 Hz).

Question 6 What vibrates

The air inside the cylinder vibrates. Keep the same cylinder and the same way of blowing (distance and strength).

Question 7 Uncertainty

10 ÷ 410 × 100 = 2.4 %; 10 ÷ 1750 × 100 = 0.57 %. The high-frequency reading has a smaller percentage uncertainty.

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