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Ultrasonic waves and Infrasonic waves soundCBSE Class 8 Science What is Infrasonic sound? Infrasonic sound is defined as a sound with a frequency of less than 20 Hz. The frequency of infrasonic sounds is below the range of human hearing ability. Infrasonic sound waves can be produced by earthquakes, thunder, and volcanic eruptions, for example. Elephants and whales can detect this sound, even if the human ear is incapable of hearing it. Elephants, whales, rhinos, and pigeons all use infrasound to communicate. What are Waves of ultrasonic sound? Ultrasonic sound is defined as sounds with a frequency of more than 20,000 hertz (cycles per second). The frequency of ultrasonic noises is higher beyond the range of human hearing ability to discriminate. The hearing range of dogs, cats, bats, and mice, for example, extends into the ultrasonic frequency region. They are able to detect wavelengths that humans are unable to detect. Ultrasound's Applications Ultrasound is also used to monitor

CBSE Class 8 Science - Combustion and Flame  Describe how the use of compressed natural gas (CNG) in automobiles has contributed to the reduction of pollution in our cities. In the following ways, the use of compressed natural gas (CNG) in cars has resulted in considerable reductions in pollution in our cities: Compressed natural gas (CNG) is a clean fuel that emits no smoke when burned, unlike other petroleum-based fuels such as gasoline and diesel. Petroleum fuel is used to power autos. Unburned carbon particles, as well as carbon monoxide (CO), a dangerous and destructive gas, are released into the air when fuel is burned. CO produces headaches, dizziness, and other symptoms. CNG burns cleanly and leaves no toxic behind. Make a list of the circumstances in which combustion occurs. The following are the conditions that lead to combustion: The presence of oxygen aids in burning. Getting the ignition temperature you want. There is flammable material present. Check out the Comparison be