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Mindmap: Sound | Science Class 9

The document Mindmap: Sound | Science Class 9 is a part of the Class 9 Course Science Class 9.
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FAQs on Mindmap: Sound - Science Class 9

1. What is sound?
Ans. Sound is a form of energy that is created by vibrations and travels through matter as waves. It can be heard by the human ear and is produced by various sources such as musical instruments, voices, and machinery.
2. How does sound travel?
Ans. Sound travels in the form of waves. When an object vibrates, it creates sound waves that travel through a medium, such as air, water, or solids. These waves transmit the energy of sound and can be detected by our ears.
3. What is the speed of sound?
Ans. The speed of sound depends on the medium through which it travels. In dry air at room temperature, sound travels at a speed of approximately 343 meters per second (or about 767 miles per hour). However, the speed can vary in different materials, such as water or solids.
4. How is sound measured?
Ans. Sound is measured in decibels (dB), which is a unit that quantifies the intensity or loudness of sound. A sound level meter is commonly used to measure sound levels, and it provides a numerical value that corresponds to the intensity of the sound wave.
5. Can sound be harmful?
Ans. Yes, sound can be harmful if it is too loud or prolonged. Exposure to loud sounds, such as those from machinery, concerts, or headphones played at high volumes, can cause hearing loss or other auditory problems. It is important to protect our ears from excessive noise to prevent damage.
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