Teaching the Kid: Middle School Wave Worksheet - Free Printable

Let's solve this Waves Worksheet #2 step by step, explaining each part clearly.

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Part 1: Labeling the Wave Diagram

The first diagram shows a transverse wave with labeled points A through F. Let's identify what each letter represents:

- A: Crest – The highest point of the wave.
- B: Wavelength – The distance from one crest to the next (or trough to trough).
- C: Amplitude – The height from the rest position to the crest (maximum displacement).
- D: Trough – The lowest point of the wave.
- E: Wavelength – Another measurement of the distance between two consecutive crests or troughs.
- F: Amplitude – The height from the rest position to the trough (same as C in magnitude).

✔ So:
- A: Crest
- B: Wavelength
- C: Amplitude
- D: Trough
- E: Wavelength
- F: Amplitude

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Part 2: Frequency Questions

Now we analyze Wave 1, Wave 2, and Wave 3.

Each wave is shown with dots representing peaks and troughs. We count how many complete wavelengths are in each wave.

#### Wave 1:
- It has 2 full cycles (one up-down-up pattern counts as one wavelength).
- ✔ Answer: 2 wavelengths long

#### Wave 2:
- This wave has 3 full cycles.
- ✔ Answer: 3 wavelengths long

#### Wave 3:
- This wave has 1 full cycle.
- ✔ Answer: 1 wavelength long

> Note: All waves are drawn over the same horizontal space, so the number of wavelengths tells us about frequency.

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#### Question 4: Which wave has the highest frequency?

Frequency = number of waves per unit time (or number of cycles in a given space). Since all waves are shown over the same length, more wavelengths → higher frequency.

- Wave 1: 2 wavelengths
- Wave 2: 3 wavelengths
- Wave 3: 1 wavelength

➡️ Wave 2 has the most cycles → highest frequency

✔ Answer: Wave 2

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#### Question 5: Which wave has the lowest frequency?

Fewest cycles → lowest frequency.

- Wave 3 has only 1 wavelength → lowest frequency

✔ Answer: Wave 3

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#### Question 6: What is the definition of frequency?

Frequency is the number of waves that pass a fixed point per second. It measures how often a wave repeats.

✔ Answer: Frequency is the number of complete waves (cycles) that pass a point per second.

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#### Question 7: How can you tell by looking at it if a wave has high or low frequency?

High frequency waves have more waves packed into the same space (shorter wavelength), while low frequency waves have fewer waves (longer wavelength).

✔ Answer: A wave with more waves in a given space has a higher frequency; fewer waves mean lower frequency.

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Part 3: Frequency Connection

We’re told:
- Dad: deep, low voice → low frequency
- Mom: medium-high voice → medium frequency
- Baby: highest voice → high frequency

From earlier:
- Wave 1: 2 wavelengths → medium frequency
- Wave 2: 3 wavelengths → high frequency
- Wave 3: 1 wavelength → low frequency

So:
- Low frequency → Dad’s voice → Wave 3
- Medium frequency → Mom’s voice → Wave 1
- High frequency → Baby’s voice → Wave 2

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#### Question 8: Which wave belongs to the dad’s voice?

✔ Answer: Wave 3

#### Question 9: Which wave belongs to the mom’s voice?

✔ Answer: Wave 1

#### Question 10: Which wave belongs to the baby’s voice?

✔ Answer: Wave 2

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✔ Final Answers:

A: Crest
B: Wavelength
C: Amplitude
D: Trough
E: Wavelength
F: Amplitude

Frequency Section:
1. Wave 1: 2 wavelengths
2. Wave 2: 3 wavelengths
3. Wave 3: 1 wavelength
4. Highest frequency: Wave 2
5. Lowest frequency: Wave 3
6. Definition: Number of complete waves passing a point per second
7. High frequency = more waves in same space (shorter wavelength); low frequency = fewer waves (longer wavelength)

Frequency Connection:
8. Dad’s voice: Wave 3
9. Mom’s voice: Wave 1
10. Baby’s voice: Wave 2

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