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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

IMPORTANCE OF INTERNATIONAL TRADE Make maximum use of raw materials Some countries have natural raw materials, such as oil (Qatar), metals (Iceland), fish (Iceland), diamonds (Congo), and butter (Iceland) (New Zealand). These countries would not benefit from the natural contributions of raw materials if a trade did not exist. Eli Hawker and Bertil Oll created the theoretical model. Countries associated with the Hecksher-Ohlin Model (H-O Model) have said that they will prioritize the manufacture and export of goods utilizing multiple local component settlements. Countries with a scarcity of resources will import. Advantage in comparison According to the principle of comparative achievement, countries with distinctive benefit costs must have special competence. Although a country may be able to produce two goods at a low cost, this does not imply that it should produce everything. With lower labour costs, India can create relatively better jobs (e.g. call centers, garment manufacturing).