The pencil's slim, lightweight structure and graphite core, known for its unique layering of carbon atoms via sp²-hybrid orbitals, are essential for its function of writing or drawing.
The structure of a pencil is tightly linked to its function. The pencil is made of a slim wooden case which is lightweight and easy to grip, enabling convenient writing or drawing. This wooden case houses a graphite center, the 'lead' of the pencil.
Why graphite? It is important to consider the properties of graphite. Graphite is soft and slippery, which allows it to easily leave marks on paper. Its structure consists of layers of carbon atoms, each connected to three others in a planar arrangement through sp²-hybrid orbitals. This layering structure allows for the graphite to be gradually worn away as the pencil writes, leaving a trail on the page, while the pencil reverts to its equilibrium state due to the torque produced by its weight.
So, in simple terms, the slim size, lightweight nature, and graphite core (with its unique structure and properties) are integral to a pencil's function of writing or drawing.
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Answer:
Explanation: Sediments or sedimentary rocks are formed from pre-existing rocks broken through the agents of denudation such as air, ice, water flow which carries the particles and deposits it, the accumulation of one layer on the others is called DEPOSITION. As the deposits keeps building, LITHIFICATION occurs which involves overburden pressure acting on the sediments in layers.
Note that during deposition oldest layers are below, while the younger layers are above
B. 39 protons, 30 neutrons, 30 neutrons
C. 39 protons, 30 neutrons, 39 electrons
D. 30 protons, 39, neutrons, 30 electrons
Answer:
D. 30 protons, 39 neutrons, 30 electrons
Explanation:
The atomic number (Z) is the number of protons (p) in the nucleus. Since
Z = 30, p = 30.
In a neutral atom, the number of electrons (e) equals the number of protons. Since p = 30, e = 30.
The mass number (A) is the number of protons plus the number of neutrons (n).
A = p + n
For an atom of zinc-69,
69 = 30 + n Subtract 30 from each side and transpose
n = 39
Zinc has the chemical symbol Zn and the atomic number 30. D. 30 protons, 39, neutrons, 30 electrons
Zinc has the chemical symbol Zn, and its atomic number is 30. This means that every atom of zinc contains 30 protons in its nucleus.
An atom of zinc-69 (Zn-69) is one that contains:
- 30 protons (since zinc has an atomic number of 30).
- 39 neutrons (subtract the atomic number from the mass number: 69 - 30 = 39).
- 30 electrons (in a neutral atom, the number of electrons is equal to the number of protons).
So, the correct option is option d 30 protons, 39 neutrons, 30 electrons.
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Energy from various energy sources, such as wind or from burning fossil fuels, is used to spin the blades of the turbine. The turbine then powers a generator, which produces electricity.
B.
Energy from various energy sources, such as wind or from burning fossil fuels, is used to spin the blades of the turbine, which produces electricity.
C.
The turbine produces energy from various energy sources like wind or burning fossil fuels to drive the generator to make electricity.
D.
The generator produces energy from various energy sources like wind or burning fossil fuels to drive the turbine to make electricity.
indium
phosphorus
antimony
2Which statement is true for both types of transistors?
Current flows from the collector to the emitter.
Current flows from the base to the emitter.
The base is between the collector and the emitter.
The base is a p-type semiconductor.
3 Which explains whether boron or arsenic is the dopant most likely used in the semiconductor layer marked with +?
This layer is the controller of an NPN transistor, so it could include boron.
This layer is the emitter of an NPN transistor, so it could include arsenic.
This layer is the controller of a PNP transistor, so it could include arsenic.
This layer is the emitter of a PNP transistor, so it could include boron.
4 What can a transistor do in order to fulfill its function in a circuit? Check all that apply.
control which layer is the emitter
control its own semiconductance
change the dopants in the transistor
act like an insulator
act like a conductor
5Which lists the layers in a PNP transistor from the least negative to the most negative?
emitter, base, collector
base, emitter, collector
collector, base, emitter
collector, emitter, base
6Roland writes a story in which boaters become stranded on a sandy island. In the story, they set about collecting materials to create semiconductors to repair computer components in their radio.
Which problem is likely to be the most difficult for Roland’s characters to overcome?
There are no semiconductor elements on the island.
Any substances they find are too impure.
They lack materials to make a p-type semiconductor.
No conductors are available to connect the components.
Arsenic is dopant for P type semiconductor
Doping means the addition of impurities to a semiconductor. It can be of two types. N type doping and P type doping. The P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions. Similarly N stands for negative and it is rich in electrons. The addition of trivalent impurities such as boron, aluminum or gallium to an intrinsic semiconductor creates deficiencies of valence electrons, called "holes". Since arsenic is trivalent so it is a dopant to p type semiconductor
The base is between the collector and the emitter.
A transistor is an electronic component that can be used as an amplifier, or as a switch. A transistor has three connectors or terminals which are the collector, the emitter, and the base. The flow of charge goes in the collector, and out of the emitter, depending on the charge flowing to the base. Base is present between collector and emitter. If it is a PNP transistor then the emitter and collector are both a p-type semiconductor material and the base is n-type and vice versa for an NPN transistor.
The right option is This layer is the emitter of a PNP transistor, so it could include boron.
In PNP transistor, the voltage between the Base and Emitter is negative at the Base and positive at the Emitter and hence the Base terminal is always biased negative with respect to the Emitter. The polarities of the current and voltage directions are reversed for any one of the possible three configurations such as Common Base, Common Emitter and Common Collector. Boron will act like trivalent having -3 valency so we can say that this layer is the emitter of a PNP transistor, so it could include boron.
the correct options are
As we know that a transistor is a current driven semiconductor device which can be used to control the flow of electric current in which a small amount of current in the Base lead controls a larger current between the Collector and Emitter so we can say that it acts like a conductor or it acts like a switch. Any Transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on. Similarly it also control its own semi conductance which means it amplifies its signal. This happens because the controlled output power can be higher than the controlling input power inside transistor.
The right option is base, emitter,collector
For a PNP transistor holes are the more important carriers, whereas electrons are the important carriers for NPN transistors. Regarding the collector in PNP, it wont give current to the emitter unless the emitter is more more positive than the base. PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current. In other words for a PNP transistor, the Emitter is more positive with respect to the Base and also with respect to the Collector.
No conductors are available to connect the components.
Since they set about collecting materials to create semiconductors to repair computer components in their radio, they can make semiconductors form sand because sand contains silica and quartz, both of them are used to manufacture semiconductors on large scale. But the connections requires wires and wires are made up of copper or any other soft metal. On integrated scale IC can be produce from and but since they are creating radio on bigger scale so they require soft metals like copper for connecting their devices.
For a p type of semiconductor we need a dopant which is from 13th group in periodic table
Al , B, Ga, In Tl
So the correct element will be In : Indium
The other elements belongs to 15th group and hence will give n type semiconductor
Gravity plays an important role in how we build our houses and structures. If gravity was much weaker on Earth, we would be able to use structures that are not as resistant. Buildings would not have to carry as much weight, which would mean that weaker materials would be able to be used.
On the other hand, much stronger gravity would mean that buildings would have to endure a lot more pressure. Moreover, everything inside the building (furniture, people, etc.) would be heavier, which would require stronger structures.