Sound waves are used in many technologies besides ultrasound, but there are some big challenges that make things tricky.

1. Communication:

   • Phone devices use sound waves to send and receive voices.
   • Challenges: Noise in the background can mix with signals, causing confusion. Plus, sound waves can only travel so far before they fade.
   • Solution: Adding noise-cancelling technology and using digital signals can help make the sound clearer and reach farther.

2. Sonar:

   • This technology is used for navigating and exploring underwater.
   • Challenges: Sound waves act differently in water based on its saltiness and temperature, which can lead to mistakes.
   • Solution: Smart algorithms that adjust to the surroundings can make the system more accurate.

3. Acoustic Levitation:

   • This method uses sound waves to lift tiny objects into the air.
   • Challenges: Setting this up is tricky and needs careful adjustments of sound frequency and volume.
   • Solution: Creating better feedback systems can make it easier to control.

In short, sound waves have many uses beyond ultrasound, but the challenges they bring can sometimes make them less useful. Luckily, with research and new ideas, we can fix many of these problems.