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satela [25.4K]
3 years ago
6

high temperature in metals leads to decrease in conductivity while increase in Temperature conductivity in semiconductor increas

es, why?​
Physics
1 answer:
Elza [17]3 years ago
8 0

Answer:

.

The conductivity of metals decreases with increasing temperature because of thermal agitation of the conduction electrons, which impedes their movement in response to an electric field and therefore lowers the drift velocity.

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An inclined plane creates a mechanical advantage of 5. What would the input force need to be to create an output force of 20 N?
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2 years ago
A scooter has wheels with a diameter of 120 mm. What is the angular speed of the wheels when the scooter is moving forward at 6.
nirvana33 [79]

To develop this problem we will apply the concepts related to angular kinematic movement, related to linear kinematic movement. Linear velocity can be described in terms of angular velocity as shown below,

v = r\omega \rightarrow \omega = \frac{v}{r}

Here,

v = Lineal velocity

\omega= Angular velocity

r = Radius

Our values are

v = 6/ms

r = \frac{d}{2} = \frac{120*10^{-3}}{2} = 0.06m

Replacing to find the angular velocity we have,

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Convert the units to RPM we have that

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4 0
3 years ago
A laser emits a beam of light whose photons all have the same frequency. When the beam strikes the surface of a metal, photoelec
seraphim [82]

Answer:

the no. of ejected electrons per second will increase.

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In photoelectric effect, when a light is incident on a metal surface it ejects some electrons from the metal surface. The energy of photon of light must be equal to or greater than the work function of that metal. All the extra energy above the work potential appears as the kinetic energy of the ejected electrons. So, greater he energy of photon greater will be the kinetic energy of the ejected electrons.

A single photon interacts with a single electron and ejects it only if its energy is greater than work function. So, the increase in no. of photons per second means an increase in the intensity of laser beam. And greater no. of photons, will interact with greater no. of electrons. So, <u>the no. of ejected electrons per second will increase.</u>

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3 years ago
A sound wave travels through water. What best describes the direction of the water particles?
balu736 [363]

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In water, the particles are much closer together, and they can quickly transmit vibration energy from one particle to the next.

A water wave is an example of a transverse wave. As water particles move up and down, the water wave itself appears to move to the right or left.

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3 years ago
Hey can someone help me with my physics exam​
ivanzaharov [21]

Answer:

by answering your question

4 0
3 years ago
Read 2 more answers
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