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### Question 7: Wave Properties

The question asks about the behavior of a wave as it moves from deep water to shallow water. You are required to determine whether the following properties of the wave increase, decrease, or stay the same as it enters the shallow water:
- **Wavelength**
- **Frequency**
- **Speed**

Here are the effects:

- **Wavelength:** **Decreases**. In shallower water, the wavelength becomes shorter because the speed of the wave decreases.
- **Frequency:** **Stays the same**. The frequency is determined by the source and does not change when the wave moves between different media.
- **Speed:** **Decreases**. In shallow water, the speed of the wave decreases due to the change in medium.

### Question 8: Speed of Sound in Water

A typical value for the speed of sound in water is approximately **1500 m/s**.

### Question 9: Ultrasound Wave in Human Tissue

Given:
- Frequency of ultrasound wave = 2.0 MHz (which is \( 2.0 \times 10^6 \) Hz)
- Speed of wave in tissue = 1500 m/s

The formula for wavelength is:
\[
\text{Wavelength} (\lambda) = \frac{\text{Speed}}{\text{Frequency}}
\]
Substitute the values:
\[
\lambda = \frac{1500 \text{ m/s}}{2.0 \times 10^6 \text{ Hz}} = 7.5 \times 10^{-4} \text{ meters} = 0.75 \text{ mm}
\]
So, the wavelength is **0.75 mm**.

### Question 10: Compression and Rarefaction

- **Compression:** This is the region of the sound wave where the air molecules are pushed closer together, resulting in higher pressure.
- **Rarefaction:** This is the region of the sound wave where the air molecules are spread further apart, resulting in lower pressure.

These alternating regions of compression and rarefaction propagate through the medium as the sound wave travels.

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Do you want further details or have any questions?

Here are 5 related questions for further practice:
1. How does the depth of water affect the refraction of waves?
2. What is the relationship between the speed of a wave and its frequency?
3. How does the speed of sound differ between air and water?
4. What are some practical applications of ultrasound technology in medicine?
5. How does sound wave intensity relate to pressure in compressions and rarefactions?

**Tip:** When waves transition between different media, the frequency remains constant, while speed and wavelength adjust to the properties of the medium.

The query submitted by the user: The image contains questions related to wave properties, speed of sound in water, ultrasound wave calculations, and explanations of compression and rarefaction in sound waves.

Understand the behavior of waves moving from deep to shallow water, calculate ultrasound wavelength in human tissue, and learn about compression and rarefaction in sound waves. Suitable for students in Grades 9-12.

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