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Infographic: Sound | Science Class 8 PDF Download
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FAQs on Infographic: Sound - Science Class 8
| 1. What is sound and how does it travel? |  |
Ans. Sound is a type of mechanical wave that is produced by vibrating objects. It travels through various mediums such as air, water, and solids by causing particles in these mediums to vibrate and transmit the sound energy. The speed of sound varies depending on the medium, being fastest in solids and slowest in gases.
| 2. What are the different types of sound waves? | |
Ans. Sound waves can be categorized into two main types: longitudinal waves and transverse waves. Longitudinal waves consist of compressions and rarefactions, where the particle displacement is parallel to the wave direction. Transverse waves, on the other hand, involve particle displacement perpendicular to the wave direction. However, sound typically travels as longitudinal waves in gases and liquids.
| 3. How is sound measured and what units are used? | |
Ans. Sound is measured in terms of its intensity and frequency. The intensity of sound is measured in decibels (dB), which quantifies the loudness of a sound. Frequency, which determines the pitch of the sound, is measured in hertz (Hz), indicating the number of cycles per second. For example, a sound with a frequency of 440 Hz corresponds to the musical note A above middle C.
| 4. What is the relationship between frequency and pitch? | |
Ans. Frequency and pitch are directly related; as the frequency of a sound wave increases, the pitch of the sound also increases. Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. For instance, a sound wave with a frequency of 1000 Hz will be perceived as having a higher pitch than a sound wave with a frequency of 100 Hz.
| 5. What are some common applications of sound in everyday life? | |
Ans. Sound has numerous applications in everyday life, including communication (speaking and listening), music production, sonar technology for navigation and mapping underwater, medical imaging techniques such as ultrasound, and noise control in various environments. Understanding sound is essential for both practical uses and improving our acoustic environments.
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Document Description: Infographic: Sound for Class 8 2025 is part of Science Class 8 preparation.
The notes and questions for Infographic: Sound have been prepared according to the Class 8 exam syllabus. Information about Infographic: Sound covers topics
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