Educational worksheet on sound measurements, covering pitch, frequency, and volume with interactive exercises.

Problem Analysis:

The worksheet focuses on understanding sound measurements, including pitch, frequency, volume, and decibels. The tasks involve matching definitions to terms, associating sounds with their average decibel levels, and explaining the difference between pitch and volume.

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Solution:

#### Part 1: Matching Definitions
We need to match each sound word with its definition. Let's analyze each option:

1. The number of vibrations per second
- This describes how many times an object vibrates in one second.
- Answer: E. frequency

2. Determined by amplitude of sound waves
- Amplitude refers to the height of sound waves, which determines loudness.
- Answer: A. volume

3. Measurement of the loudness of sound
- Loudness is measured using decibels.
- Answer: D. decibels

4. Highness or lowness of a sound
- This describes pitch, which is determined by the frequency of vibrations.
- Answer: B. pitch

5. Frequency is measured by this
- Frequency is measured in hertz (Hz).
- Answer: C. hertz

#### Matching Answers:
1. E
2. A
3. D
4. B
5. C

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#### Part 2: Matching Sounds with Decibel Levels
We need to associate each sound with its average decibel level. Here’s the reasoning:

6. A vacuum cleaner
- Vacuum cleaners are relatively loud but not extremely so.
- Answer: 85 decibels

7. A jet
- Jets are extremely loud due to their engines.
- Answer: 120 decibels

8. The rustle of leaves
- The rustle of leaves is very soft and quiet.
- Answer: 15 decibels

9. Normal conversation
- Normal conversation is moderately loud but not overly so.
- Answer: 60 decibels

#### Matching Answers:
6. 85 decibels
7. 120 decibels
8. 15 decibels
9. 60 decibels

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#### Part 3: Describe the Difference Between Pitch and Volume
- Pitch: Refers to the highness or lowness of a sound. It is determined by the frequency of sound waves. Higher frequencies result in higher pitches, while lower frequencies result in lower pitches.
- Volume: Refers to the loudness or softness of a sound. It is determined by the amplitude of sound waves. Larger amplitudes result in louder sounds, while smaller amplitudes result in softer sounds.

#### Explanation:
Pitch and volume are two distinct properties of sound. Pitch is about the frequency of vibrations, which affects how high or low a sound seems. Volume is about the amplitude of vibrations, which affects how loud or soft a sound seems. For example, a flute can play a high-pitched note softly or loudly, depending on how hard it is blown.

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Final Answer:

1. E
2. A
3. D
4. B
5. C
6. 85 decibels
7. 120 decibels
8. 15 decibels
9. 60 decibels
10. Pitch refers to the highness or lowness of a sound, determined by frequency. Volume refers to the loudness or softness of a sound, determined by amplitude. They are independent properties: a sound can be high-pitched and loud, high-pitched and soft, low-pitched and loud, or low-pitched and soft.

$$
\boxed{E, A, D, B, C}
$$
$$
\boxed{85, 120, 15, 60}
$$
$$
\text{Pitch is about frequency (highness/lowness), while volume is about amplitude (loudness/softness).}
$$