Why was the discovery of high-temperature superconductors so startling to scientists?

Why was the discovery of high temperature superconductors so startling to scientist?

It was startling because it was said to be impossible by the BCS theory.

What are pleasant and unpleasant sounds?

Pleasant sounds are those which make us feel happy, comfortable, or evoke positive emotions:ocean wavesmusic (different types, depending on the individual's taste)babbling brookfireplace cracklingchildren's laughterUnpleasant sounds are those which make us cringe, plug our ears, or evoke negative emotions. Examples:cryingdrilling/constructiontraffic/honkingsomething that might be startling, such as thunder, a glass breaking, or a sirenfireworks

What causes electric shock current or voltage?

A spark from a metal door-knob, or from another person, or from a toy Van de Grafgenerator ... a high-voltage, low-current discharge ... can cause a startling surprise,but little lasting harm.An appreciable current passing through parts of the body, however, can burn flesh,cause drastic and involuntary nerve and muscle responses, and disrupt the orderlyand normal operation of the heart.

What is meter stick and their uses?

In 1983 the 17th CGPM (Resolution 1) redefined the meter in terms of the speed of light in a vacuum. The value for the speed of light, 299,792,458 meters per second, had already been recommended in 1975 by the 15th CGPM, (Resolution 2). Its use in the meter's definition made the speed of light fall within the limits of uncertainty of the best existing measurements. Though this is a rather technical definition, it is the most correct. In the past, the meter or metre if you're European, has been defined as: 1) Jean Picard, Olaus Rømer and other astronomers had suggested that a unit of length be defined as the length of a pendulum with a period of 2 seconds. (A pendulum's period is the time it takes to make one complete swing back and forth). It was already known that identical pendulums set up in different places had different periods, so any such a definition would have to specify a location for the standard pendulum. 2) one ten-millionth of the earth's quadrant. Today the length of the earth's quadrant can be measured relatively easily by the use of satellites. Such measurements show that the meter is actually about 1/5 of a millimeter shorter than one ten-millionth of the earth's quadrant. The startling thing about this fact is not that the meter does not conform to its original conception, but that two 18th century surveyors should have come so close.

Tympanometry?

DefinitionTympanometry is a test used to detect disorders of the middle ear.Alternative NamesTympanogramHow the test is performedBefore the test, your health care provider will look inside your ear canal to make sure there is a clear path to your eardrum.Next, a device is placed into your ear. This device changes the air pressure in your ear and makes the eardrum move back and forth. A machine records the results on graphs called tympanograms.How to prepare for the testYou should not move, speak, or swallow during the test. Such movements can change the pressure in the middle ear and give incorrect test results.The sounds heard during the test may be loud and potentially startling. You will need to try very hard to avoid being anxious and becoming startled during the test.If your child is to have this test done it may be helpful to show how the test is done using a doll. The more familiar your child is with what will happen and why, the less anxiety he or she will feel.How the test will feelThere may be some discomfort while the probe is in the ear, but no harm will result. You will hear a loud tone as the measurements are taken.Why the test is performedThis test measures your ear's responses to the sound and different pressures.Normal ValuesThe pressure inside the middle ear can vary by 100 daPa (a very small amount). The eardrum should look smooth.What abnormal results meanTympanometry may reveal any of the following:A tumor in the middle earFluid in the middle earImpacted ear waxLack of contact between the conduction bones of the middle earPerforated ear drumScarring of the tympanic membraneWhat the risks areThere are no risks.ReferencesSeidman MD, Simpson GT II, Khan MJ. Common problems of the ear. In: Noble J, eds. Textbook of Primary Care Medicine. 3rd ed. Philadelphia, Pa: Mosby Elsevier; 2001:chap 178.Cummings CW, Flint PW, Haughey BH, et al. Otolaryngology: Head & Neck Surgery. 4th ed. St Louis, Mo; Mosby; 2005:3514.Reviewed ByReview Date: 04/26/2010Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

Why was the discovery of high-temperature superconductors so startling to scientists?

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