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What is the ratio of output power to input power called?

Amplifier gain does not have any unit because it is a ratio of the same unit signals. However, when the gain is represented in the logarithmic scale, it has a unit. The unit is the decibel, which is a one-tenth fraction of bel. The decibel notation is also used to express the amplitude of various signal parameters, such as voltage and current, relative to a given reference level.

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How many neutrons does strontium have?

Strontium does not exist freely in nature. It was discovered in a sample of witherite by Adair Crawford in 1790. As he was in Scotland at the time of his discovery, he named his find strontianite after the Scottish town Strontian. However, in the early 1800s, the chemist Humphrey Davy isolated strontium through the electrolysis process. Strontium also is found in the ore celestite. This element is soft and silvery in appearance, it turns a yellowish color through the oxidation process. Although strontium has 28 isotopes, only four of these are stable.\n\nStrontium has many uses, some of which ..

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How many motor neurons innervate each muscle fiber?

A single motor neuron can innervate many muscle fibers to form a motor unit, notes the University of Texas. Motor neurons release acetylcholine at their synapses with the muscle fibers in a cleft termed the neuromuscular junction. This release of neurotransmitter is unusual in the nervous system, as it is very large and enough to depolarize all the muscle fibers in the motor unit above their threshold, according to the University of Washington.

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Is there any place where a labeled skeletal system diagram can be found?

The human skeleton system, which comprises of more than 200 bones, offers protection for the body's internal organs. It also gives the body's shape, movements and support. The human body is able to move because of the coordination between the muscular system and the skeletal system. The bone marrow produces red and white blood cells. Some of the key bones are the cranium, which protects the brain, and the ribs and sternum, which protect lungs and heart. Bones like the humerus, ulna, radius, tibia, fibula, tarsals, femur, metatarsals, carpals and metacarpals make up the human limb sys..

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What are some natural resources in Pennsylvania?

Pennsylvania's natural gas resources mainly come from the Marcellus Shale, with production estimated at 4 trillion cubic feet as of 2014. The state is the only one in the country that produces anthracite coal, which contains a higher heat value compared to other kinds of coal. Coal supplies about 36 percent of the state's energy needs. With more than 60 percent of the state covered in forests, forestry is the fourth most important industry in the state. About 79 percent of commercial forests are privately owned.

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What is terrestrial radiation?

Earth's atmosphere generally permits the free passage of sunlight in the visible band of the spectrum. Most of this light reaches the surface, whether oceanic or continental, and is absorbed. There is an upper limit to the energy that can be stored in the Earth's crust this way, however, and once the saturation point is reached, Earth begins to radiate energy back into space.\nSome of this terrestrial radiation is intercepted by atmospheric gases. Apart from nitrogen and oxygen, virtually all the common gases in the atmosphere absorb some terrestrial radiation. This trapped energy is..

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How does a hydraulic ram pump work?

The main components of a common hydraulic ram pump are the water pipeline, brass swing-check valve, spring-check valve, and pressure chamber. The process starts with a steady stream of water that passes through the pipeline and the swing-check valve. As the fluid velocity increases, the water pulls the flapper of the swing-check valve and closes it abruptly. This causes a water-hammer effect that produces a quick pressure increase that pushes the adjacent spring-check valve open. The flow of water going into the spring-check valve carries a high hydraulic pressure that is collected by the pres..

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What does the "C" stand for in E=mc^2?

This equation comes from Einstein's theory of special relativity. The equation shows that the mass (m) of an object is determined by its kinetic energy (E) divided by the speed of light (c) squared. Einstein created this equation to show that mass and energy are interchangeable. With this equation, he was able to argue that mass and energy are actually the same thing, and to convert one to the other, you simply need to factor in the speed of light.

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What is the scientific classification of fish?

The Mxyini and Cephalspidomorphi are composed of the primitive hagfish and lampreys, respectively. These fish lack jaws and are thought to be descendants of some of the most ancient fish. The Chondrichthyes class is comprised of the sharks, rays and their allies. These fish lack bony skeletons and instead feature cartilaginous skeletons. Finally, the Osteichthyes are represented by the bony fish. Most common, familiar fish, such as trout, bass and perch, are members of the bony fishes.\nWhile the scientific classification of the large groupings is unlikely to change and is supported by signifi..

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What temperature does water evaporate at?

However, there are some circumstances that typically require water to be certain temperatures. For example, water freezes at 32 F or zero C. The boiling point of water is 212 F or 100 C. Though the Fahrenheit scale was popular through the mid-1970s in the English-speaking world, most countries have since begun using the Celsius scale.

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