Category: Physics

What is the wavelength of an electron of energy 20 eV? m = 0.0275 nm. What is the broccoli wavelength of an electron whose kinetic energy is 120 eV? Answer. Therefore, the de Broglie wavelength of the electron is 0.112 nm. What is the wavelength of an electron whose kinetic energy is 120 eV? Thus […]

What is the scientific name for iodine? Iodine is a chemical element with the symbol I and atomic number 53. The element was discovered by the French chemist Bernard Courtois in 1811, and was named two years later by Joseph Louis Gay-Lussac, after the Greek ἰώδης “violet-coloured”. Does iodine have any other name? Atomic number […]

Can I live in Alaska for free? Do you get paid to live in Alaska? While it’s a common misconception that you can move there for free, you can get paid to live in Alaska. The Alaska Permanent Fund Dividend (PFD) takes the state’s oil wealth and shares an annual portion with all permanent residents […]

Which state of water has the most hydrogen bonds? Liquid water’s How do you calculate the number of hydrogen bonds? You can use Hbond command, and then count the number in the Hbond list. You can use the same method to calculate the contact number. How many water molecules can hydrogen bond to methanol? Water […]

Is Telegraph still used? It is no longer a major means of commercial or maritime communications, but it is still used by amateur radio operators. New technology and devices kept appearing and led to a continual evolution of the telegraph industry during the latter half of the 19th century and the first half of the […]

Can you go blind from staring at a light bulb? In general no, in special circumstances yes. It would be very difficult to make a “light bulb,” i.e., and incandescent light, that would produce enough UV to damage your retina. For example staring at a car headlamp with a halogen bulb for an extended time […]

Which bacteria helps in improving the soil fertility? Rhizobium is an example of a symbiotic bacterium that attaches to the roots of leguminous plants and it increases the soil fertility by converting atmospheric nitrogen into organic compounds. How are living organisms important for improving soil fertility class 7? Living organism are important in soil fertility […]

What technology is used in artificial selection? Inbreeding How are artificial selection and natural selection similar? Natural selection and selective breeding can both cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but selective breeding only occurs when humans intervene. For this reason selective breeding is sometimes […]

What is the evidence that a new substance has been made? There are signs that a chemical reaction occurs. Bubbles form, a gas is given off, and the beaker gets very hot. The most important sign that a chemical reaction occurs is the formation of new substances. The new substances are carbon, a brittle black […]

How does fossil fuel harm the environment? Fossil fuels produce large quantities of carbon dioxide when burned. Carbon emissions trap heat in the atmosphere and lead to climate change. In the United States, the burning of fossil fuels, particularly for the power and transportation sectors, accounts for about three-quarters of our carbon emissions. How do […]