Class 7 Exam > Class 7 Videos > IGCSE Cambridge Science for Year 7 > Video: How sound travels
Video: How sound travels Video Lecture | IGCSE Cambridge Science for Year 7 - Class 7
FAQs on Video: How sound travels Video Lecture - IGCSE Cambridge Science for Year 7 - Class 7
| 1. How does sound travel through different mediums? |  |
Ans. Sound travels through different mediums by causing the particles in the medium to vibrate. These vibrations create a series of compressions and rarefactions that travel through the medium as sound waves.
| 2. What is the speed of sound in air and how does it vary with different factors? | |
Ans. The speed of sound in air is approximately 343 meters per second at room temperature. This speed can vary depending on factors such as temperature, humidity, and the composition of the medium through which the sound is traveling.
| 3. How does the frequency of a sound wave affect its pitch? | |
Ans. The frequency of a sound wave determines its pitch. Higher frequency sound waves have a higher pitch, while lower frequency sound waves have a lower pitch. This is why different musical notes have different frequencies.
| 4. Can sound travel through a vacuum? | |
Ans. No, sound cannot travel through a vacuum because it requires a medium to propagate. In a vacuum, there are no particles for the sound waves to interact with, so they cannot travel.
| 5. How do different animals use sound for communication and navigation? | |
Ans. Different animals use sound for communication and navigation in various ways. For example, dolphins use echolocation to navigate and locate prey, while birds use songs to attract mates and establish territories. Each animal has evolved unique ways to utilize sound in its environment.
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Oct 05, 2025
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