Properties of Waves - Free Printable

Let's solve this step by step.

We are given a wave diagram and a list of words to use to label parts of the wave and complete definitions. The words are:

Words to use:
- Hertz
- period
- metres
- dip
- seconds
- peak
- wavelength
- trough
- crest
- amplitude
- oscillation
- equilibrium line

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Step 1: Label the Diagram

Looking at the wave diagram:

1. Top of the wave: This is called the crest (or peak – both are synonyms in wave terminology).
2. Bottom of the wave: This is the trough.
3. The horizontal dashed line: This is the equilibrium line (also called the rest position).
4. Distance between two consecutive crests (or troughs): This is the wavelength.
5. Vertical distance from the equilibrium line to the crest (or trough): This is the amplitude.
6. The time for one full cycle (not shown directly, but implied): This is the period, measured in seconds.
7. Number of waves per second: This is frequency, measured in Hertz.

Now let’s fill in the diagram:

From left to right:

- The long arrow spanning from one crest to the next → wavelength
- The vertical arrow from the equilibrium line to the crest → amplitude
- The dashed line → equilibrium line
- The top point of the wave → crest (or peak)
- The bottom point → trough

So the diagram labels are:

- Top left: wavelength
- Vertical arrow: amplitude
- Dashed line: equilibrium line
- Top of wave: crest or peak
- Bottom of wave: trough

> Note: "Peak" and "crest" are often used interchangeably; same with "dip" and "trough", but "dip" is less formal. We’ll use standard terms.

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Step 2: Complete the Definitions

Now fill in the blanks using the words.

1. ______ - the top of a wave
→ crest or peak
✔ Use: crest or peak — both acceptable. Let’s use crest.

2. ______ - the bottom of a wave
→ trough

3. ______ - the level if the wave flattened out
→ equilibrium line

4. ______ - a repeated action back and forth or up and down
→ oscillation

5. ______ - the number of waves that pass every second (measured in ______)
→ frequency – measured in Hertz

6. ______ - the time it takes for one complete wave to pass (measured in ______)
→ period – measured in seconds

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✔ Final Answer:

#### Diagram Labels (from the image):

- Long horizontal arrow (between crests): wavelength
- Vertical arrow (from equilibrium to crest): amplitude
- Dashed horizontal line: equilibrium line
- Top of wave: crest
- Bottom of wave: trough

#### Definitions:

1. crest – the top of a wave
2. trough – the bottom of a wave
3. equilibrium line – the level if the wave flattened out
4. oscillation – a repeated action back and forth or up and down
5. frequency – the number of waves that pass every second (measured in Hertz)
6. period – the time it takes for one complete wave to pass (measured in seconds)

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Summary of Words Used:

- wavelength – used once
- amplitude – used once
- equilibrium line – used once
- crest – used once
- trough – used once
- oscillation – used once
- frequency – used once
- Hertz – used once
- period – used once
- seconds – used once

Unused words: peak, dip, metres
(Note: "peak" is synonymous with "crest", "dip" with "trough", and "metres" could be unit for wavelength/amplitude but not needed here.)

✔ All required blanks are filled correctly.