0
What else can I help you with?
What are all materials classified as?
Materials can be classified as either natural or synthetic. Natural materials are those that occur in nature, such as wood, cotton, and wool, while synthetic materials are man-made, such as plastic, nylon, and polyester. Materials can also be classified based on their properties, such as metals, ceramics, polymers, and composites.
Which of the following represent special types of materials that may contain classified informationPhotographsCDs containing classified informationWorking papersAll of these?
All of these represent special types of materials that may contain classified information.
When a sample of germanium and silicon having same impurity density are kept at room temperature then resistivity of both?
The resistivity of germanium will decrease with increasing temperature due to a positive temperature coefficient of resistivity, while the resistivity of silicon will increase with increasing temperature due to a negative temperature coefficient of resistivity. At room temperature, silicon will have a higher resistivity compared to germanium.
Which of the following represent special types of materials that may contain classified information?
Photographs CDs containing classified information Working papers All of these Answer: All of these
What is a material that holds electrons tightly?
Materials that hold electrons tightly typically have a high electrical resistivity, such as insulators like rubber, glass, or plastic. These materials do not conduct electricity easily because the electrons are strongly bound to the atoms and do not move freely.
How are substances classified on the basis of resistivity?
Substances are classified based on their resistivity as conductors, insulators, or semiconductors. Conductors have low resistivity and easily allow the flow of electric current. Insulators have high resistivity and inhibit the flow of electric current. Semiconductors have resistivity values between conductors and insulators, making them suitable for controlling the flow of current in electronic devices.
Does high resistivity have a higher number or lower number?
High resistivity corresponds to a higher numerical value. In the context of materials, resistivity is a measure of how strongly a material opposes the flow of electric current; materials with high resistivity, like rubber or glass, have larger resistivity values compared to conductive materials like copper or aluminum, which have low resistivity values.
Why do the values of resistivity differ so much between materials?
The values of resistivity differ between materials due to variations in their atomic structure, electron configuration, and bonding characteristics. Materials with more free electrons, such as metals, have lower resistivity, while insulating materials with tightly bound electrons have higher resistivity. The presence of impurities and defects in a material can also influence its resistivity.
Why do some materials have more resistance than others?
Materials with more resistance have a higher resistivity, which is a measure of how strongly a material impedes the flow of electric current. Factors such as the material's atomic structure, temperature, and impurities can affect its resistivity. Materials like metals tend to have low resistivity due to their abundance of free electrons, while insulating materials have higher resistivity as they inhibit the movement of electrons.
What is the reason for such large variations in resistivity of different materials?
The resistivity of a material depends on its atomic and molecular structure, such as the arrangement of atoms and the number of free electrons. Materials with a highly ordered structure like metals tend to have low resistivity due to the easy flow of electrons, while materials with disordered structures like insulators have high resistivity because they impede the flow of electrons. Other factors like temperature and impurities can also affect resistivity.
Can resistivity be negetive?
No, resistivity cannot be negative. Resistivity is a material property that indicates how strongly a material opposes the flow of electric current. It is always a positive quantity, even though some materials may have very low resistivity values.
What is resistivity on what factor is depends?
Resistivity is a measure of a material's ability to resist the flow of electric current. It depends on factors such as the material's composition, temperature, and dimensions. Materials with high resistivity impede the flow of current more than those with low resistivity.
Is it true that a material with high resistivity is a good conductor?
No, a material with high resistivity is a poor conductor. Resistivity is a property that quantifies how much a material resists the flow of electric current. Materials with high resistivity impede the flow of current, making them poor conductors.
Is resistivity of a conductor temperature dependent?
A perfect insulator has infinite ohms of resistance.
What is the basis for the classification of clouds?
Clouds are classified on the basis of their form and height.
What is electrical resistivity of molybdenum?
The electrical resistivity of molybdenum is approximately 5.50 x 10^-8 ohm-meters at room temperature. It is considered a good conductor of electricity due to its relatively low resistivity compared to insulating materials.
The uses of earth resistance measurement?
Measuring the resistivity of earth/soil is used in archaeology. The resistivity of different materials allows a 2-D image of foundations, ditches etc to be constructed.
