sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing. Used to make an image of a person's internal body structures (muscles, tendons, abdominal and pelvic organs, heart and blood vessels).
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Infrasound
sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. Elephants and giraffes use infrasound to communicate between herds over long distances. ... Infrasound can be used to detect volcanic eruptions.
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speed of sound = ?
speed of sound = frequency * wavelength
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Geiger counter
Geiger counters are used to detect radioactive emissions, most commonly beta particles and gamma rays. The counter consists of a tube filled with an inert gas that becomes conductive of electricity when it is impacted by a high-energy particle.
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Background radiation
the uniform microwave radiation remaining from the Big Bang.
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Scalar
Scalar is the measurement of a medium strictly in magnitude. E.g. speed, volume, mass, temperature, power, energy, and time.
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Vector
a quantity that has both magnitude and direction. E.g. velocity, weight.
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If the speed of an object moving in a circle increases (e.g. a satellite in orbit) ..?
... the size of the circle decreases.
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Red shift
Redshift happens when light or other electromagnetic radiation from an object undergoes an increase in wavelength.
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CMB
The cosmic microwave background is electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology.
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Dangers and uses of radio waves
Radio waves are used for communication and broadcasting. Large doses of radio waves are believed to cause cancer, leukaemia and other disorders.
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Dangers and uses of microwaves
Used for cooking by making water molecules vibrate. Microwaves cause internal heating of body tissues.
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Dangers and uses of infrared
Exposure to intense electromagnetic radiation, including infrared radiation, can damage the lens and cornea of the eye. This is one reason why staring at the sun is harmful. One of the most common uses of infrared radiation is in heat-sensitive therm
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Dangers and uses of visible light
Visible light is typically pretty harmless. However, some light can be so intense that it can damage the receptor cells in your eye causing temporary or permanent blindness. Visible light is used for photography.
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The higher the frequency of radiation..?
... the more damage it is likely to cause to the body.
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Dangers and uses of ultraviolet
Large doses cause sunburn and skin cancer. Used to kill microbes and to treat vitamin D deficiency.
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Dangers and uses of xray
Can destroy tumors, skeletal scans. Large amounts of x rays can cause cancer.
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Dangers and uses of gamma
Gamma rays can penetrate the skin and harm cells. Can kill cancer cells.
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Renewable source of energy
Sunlight, wind, rain, tides, waves, and geothermal heat. Simply put, a solar panel works by allowing photons, or particles of light, to knock electrons free from atoms, generating a flow of electricity.
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Non-renewable energy
Most non-renewable energy sources are fossil fuels: coal, petroleum, and natural gas. Carbon is the main element in fossil fuels.
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potential energy definition
potential energy is the energy possessed by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
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GPE = ?
GPE = mgh
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Kinetic energy definition
energy which a body possesses by virtue of being in motion.
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KE = ?
KE = 0.5*mv^2
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Momentum
the quantity of motion that an object has
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p = ?
p = mv
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Conservation of momentum
Conservation of momentum is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system. It is embodied in Newton's first law (the law of inertia).
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Other cards in this set
Card 2
Front
Infrasound
Back
sound that is lower in frequency than 20 Hz or cycles per second, the "normal" limit of human hearing. Elephants and giraffes use infrasound to communicate between herds over long distances. ... Infrasound can be used to detect volcanic eruptions.
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