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Technology

The practical application of knowledge, especially in a particular area, is called technology. Advances in technology affect every area of our lives. This category is for questions about technology and includes everything from how to remove a scratch from a CD to applications of electronics to what polyester is made from and more.

35,090 Questions

What is crystaline material?

Crystalline is a solid material whose constituent atoms, molecules or ions are arranged in an orderly repeating pattern that extends in all three spatial dimensions. The scientific study of crystals and crystal formation is known as crystallography.

Why did it take so long to figure out how to make white LEDs?

There is no such thing as a white LED.

You produce white light from LEDs by combining red, green and blue LEDs.

Red LEDs were produced first because red is a low frequency of light. It was the easiest to make.

Green LEDs were produced next because green is a higher frequency of light. It was harder to make.

By combining red and green LEDs, you can produce yellow light.

Blue is a very high frequency of light and is very hard to produce. Blue LEDs and blue lasers (as in BluRay) took a great deal of effort to create. LED technology and some kinds of laser technology are very closely related.

Is looking at a laser more dangerous than looking at a light-bulb of the same intensity?

Yes, looking at a laser can be more dangerous than looking at a light bulb of the same intensity. This is because lasers emit highly concentrated, powerful beams of light that can cause eye damage much more quickly than the diffused light from a light bulb.

What metals are used to make ferromagnets?

Iron, nickel, and cobalt are the most common metals used to make ferromagnets. These metals have magnetic properties that allow them to be easily magnetized and retain their magnetism.

Movement of one body around another body?

This movement is called orbiting, where one body revolves around another due to gravitational attraction. The body being orbited is typically larger and more massive, while the orbiting body is referred to as a satellite. Orbits can be either elliptical or circular depending on the initial conditions and speed of the orbiting body.

What is a fule cell?

A fuel cell is a device that converts chemical energy from a fuel into electricity through an electrochemical reaction. It typically consists of an anode, a cathode, and an electrolyte. Fuel cells are used in various applications, including powering vehicles and providing electricity for buildings.

Is metal sustainable?

Metal can be sustainable when extracted and processed using environmentally-friendly methods, such as recycling. However, the mining and production of primary metals can have negative impacts on the environment and ecosystems. Recycling metal reduces the need for primary metal extraction and helps conserve natural resources.

How does an old seismograph work?

The seismograph works as follows. A pen, along with a particular calculated amount of (small) weight is attached to a spring. The other end of the spring is attached to a heavy and stable(so that it can with stand the earthquakes) base support. When an earth quake occurs, the movement of the smaller weight is recorded on a roll of moving paper by the pen. Then the extent of the earthquake is measured by those graphs(seismographs).

The insulator keeps the electricity inside the wire and?

prevents it from escaping into the surrounding environment. Insulators are materials with high resistance to electrical current, helping to maintain the flow of electricity along the intended path. Without insulators, there would be a risk of electric shock or short circuits.

What some things which use light?

Most living organisms, you included, and of course, plants.

Why doesn't ceramic conduct electricity?

Ceramic materials are typically non-conductive because their atomic structure does not allow for the easy movement of electrons. This means that electrons cannot flow through the material to create an electrical current. Additionally, ceramics are usually insulators with high resistivity, further inhibiting electrical conduction.

What are the customs and traditions of Christianity?

Customs? well. Easter and Christmas. some people have ash wendsday and good friday There are really no traditions unless you count baptism which is "purifying" someone with water. It actually means to start over and give ur life fully to God. Communion- the metaphorical passing of jesus' blood and body (wine + bread). It is from Jesus' last supper w/ his disiples before he died for mankinds sins. Easter is when Jesus came back from the grave to complete his sacrifice and go to heaven with his father. Christmas is when Jesus was supposidly born. Prayer to God i guess is a custom.

What is the strongest natural fiber?

Spider silk is widely considered to be the strongest natural fiber. It has a tensile strength that is comparable to steel, yet it is lightweight and flexible.

Does lighter objects have mor or less inertia then heavier objects?

Lighter Objects have LESS "inertia". Mass is physical manifestation of inertia. Mass is weight so the more mass the more potential inertia to over-come -- either to make an object move or to stop an object once it is moving.

So, if a meteorite weighing 1 gram hits a space station weighing 1,000 tons the likelihood of the object causing damage is proportional to the speed of the meteorite; but if the meteorite weighs 1,000 tons (same as space station) the sheer mass alone would cause damage (regardless of movement because any movement would be too much.)

Is compression a drag force?

No, compression is not a drag force. Compression refers to the reduction in size or volume of a substance due to external pressure, while drag force is a resistive force that opposes an object's motion through a fluid.

How many mAh does a 9.6v have?

To calculate the mAh capacity, we need to know the current rating of the battery as well. The mAh (milliampere-hour) capacity is a measure of how much charge a battery can hold over time. It is not determined solely by the voltage (9.6V in this case) but also by the current rating of the battery.

Why are blobs big?

Blobs appear big due to their amorphous and shapeless structure, which lacks defined boundaries or edges. Their size can vary depending on the amount of material they contain or the environment they are in. Blobs are often depicted as large to emphasize their formless and ever-changing nature.

Why does a battery supply direct current?

A battery supplies direct current (DC) because it produces a constant flow of electrons in one direction within the circuit. This is achieved through a chemical reaction that establishes a potential difference. In contrast, alternating current (AC) changes direction periodically, making it more suitable for long-distance power transmission.

What is a small angled surface formed between two surfaces?

A small angled surface formed between two surfaces is called a chamfer. Chamfers are typically created to ease sharp edges or remove burrs, and they can also provide a finished appearance to a part or product.

What does pewter the metal feel like?

Pewter is a physically weighty metal alloy made from Lead and Tin (with trace quantities of Zinc and Nickel). To the touch it is naturally cool, and can be worked to feel very smooth. It also has an unusual (for metal) soft feel to it, almost like hard plasticine; you can gouge a fairly deep scratch in it with your fingernail for instance. It is a very pliable metal. Even at room temperature you can bend a relatively thick piece of Pewter with just your hands. Pieces up to around 6mm thick can be torn like paper by a person of average strength, in which respect it is much the same as Lead. It should be noted that some people are naturally mildly allergic to Pewter, and, while allergic reactions of any kind vary from person to person, the typical reaction to Pewter is that of small redened patches of skin and itching in the place that was in contact with the metal. I include this note only because some jewelery is made from Pewter. It is no more likely to cause a reaction than silver or gold, but as with any allergy, all individuals are different.

Which was the first thing to electricity?

your question makes no sense, to USE electricity? GENERATE electricity?

I think to use.

Why do smoke detectors beep at night?

Smoke detectors may beep at night for several reasons, such as low battery power, dust or debris blocking the sensor, or high humidity causing condensation. It is important to investigate the cause of the beeping to ensure the smoke detector is functioning properly and to address any potential safety hazards.

What are benefits of raw materials?

Raw materials are used to produce basic metal and chemical products, which are then used to produce finished goods. For example Bauxite is the basic raw material used to make aluminum ingot, which is then remelted, alloyed, and cast into products as varied as aluminum pistons, beer cans, aluminum wheels and hoods for your car, or many parts in airplanes.

Crude oil is another raw material with varied used; when refined in a 'cracking tower', it produces products ranging from kerosine to gasoline to heavy fuel to petrochemicals.

What process is used to make visine?

visine is 99.9% water. just saline drops with preservatives some varieties have very small amount of lubricating molecules like polymethacrylic acid, etc. I'm not sure some might also have oxymetazoline (a vasoconstrictor in small amounts)

Can you increase the force and direction?

To increase force, you can exert more physical effort or use mechanical advantage like a lever or pulley system. To change direction, adjust the angle or orientation of the force to push, pull, or lift in a different way. Always ensure proper technique and safety measures when modifying force and direction.