Answer: Direct current = that moves in only one direction
Explanation :
Electric current is defined as the electric charge per unit time. The electric current is of two types
In direct current, the current flows one in one direction while in alternating current the current changes its direction periodically. So, the correct statement that describes the direct current is " (C) that moves in only one direction ".
B) Mg2F2.
C) MgF.
D) MgF2.
Answer is: D) MgF₂.
Magnesium fluoride is salt, ionic compound.
1) Magnesium (Mg) is metal from 2. group of Periodic table of elements and has low ionisation energy and electronegativity, which means it easily lose valence electons (two valence electrons).
Magnesium has atomic number 12, which means it has 12 protons and 12 electrons. It lost two electrons to form magnesium cation (Mg²⁺) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.
Electron configuration of magnesium ion: ₁₂Mg²⁺ 1s² 2s² 2p⁶.
2) Fluorine (F) is nonmetal with greatest electronegativity, which meand it easily gain electrons.
Fluorine jas atomic number 9, which means it has 9 protons and 9 electrons. It gain one electron to form fluorine anion (F⁻) with stable electron configuration like closest noble gas neon (Ne) with 10 electrons.
Electron configuration of fluorine ion: ₉F⁻ 1s² 2s² 2p⁶.
Answer:
150 I would believe that it is the correct answer
to block ultraviolet rays.
b.
to block infrared rays.
c.
to block glare from reflections (for example off lakes or roads).
d.
to look cool.
The primary purpose of polarized sunglasses is to block glare from reflections (for example off lakes or roads). The correct option is C.
Polarized sunglasses are a type of eyewear that has a special filter that blocks intense, reflected light and reduces glare. The filter is oriented vertically, allowing only the vertical component of light waves to pass through, while blocking the horizontal component. This reduces the glare from flat surfaces, such as water or snow, which can be distracting and even dangerous. Polarized sunglasses also enhance contrast and provide clearer vision, making them popular among athletes and outdoor enthusiasts. They are especially useful for activities such as fishing, boating, skiing, and driving. Polarized sunglasses can come in a variety of styles and lens colors, and can be worn in both prescription and non-prescription forms.
eEre in the Question,
Option a, to block ultraviolet rays, is true to some extent. Polarized sunglasses may have UV-blocking properties, but their primary purpose is not to block UV rays.
Option b, to block infrared rays, is not true. Polarized sunglasses are not designed to block infrared rays.
Option d, to look cool, is not true. While some people may wear polarized sunglasses for fashion purposes, their primary purpose is to reduce glare and improve visibility.
Therefore, The correct option is C. to block glare from reflections (for example off lakes or roads).
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B. X-rays
C. Ultraviolet
D. Infrared
Solar, wind, and geothermal energy sources are all renewable. They derive their energy from natural processes that replenish themselves over time.
There are a few things that are true about solar, wind, and geothermal energy.
Renewable energy sources include solar, wind, and geothermal power. They get their energy from natural processes that grow back eventually. Solar energy comes from the sun, wind energy comes from the movement of air, and geothermal energy comes from heat inside the Earth.
They are all environmentally friendly which means that it doesn't harm the environment. Solar, wind, and geothermal energy sources are better for the environment than fossil fuels. They release very little greenhouse gases when they are being used, which helps to prevent climate change and make the air cleaner.
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