The document discusses sound and its characteristics such as loudness, pitch, frequency, timbre, and how they are affected by different factors. It emphasizes that loudness increases with amplitude, pitch increases with frequency, and timbre helps identify sound sources. Behaving quietly in schools and hospitals is important because excessive noise can disturb others and hinder work and recovery.
this is a notes of sound for class 8 students. this will help you to revise the chapter very quickly. recap is also included in this.
with the help of pictures you will be able to understand it quickly.
18. Sound can be pleasant or unpleasant. Noise is categorized as an unpleasant sound. Most countries are now affected not only by air pollution . Both are harmful to one’s health. For instance, noise caused by the honking of horns, shrilling voices and scuffling of feet can aggravate a sick person’s condition. Scientists have found out that people get more work done in quiet places than in noisy areas. In fact, a person can do 25% more work in a quiet room. Knowing all these:
