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Rudiy27
3 years ago
11

The photometer is a device that converts light to voltage which is read out by the digital multimeter (DMM). This is due to the

photoelectric effect. (Einstein won his Nobel Prize for his explanation of the photoelectric effect.) In the photoelectric effect, light hits a piece of metal. Quantum mechanics tells us that light can be thought of as tiny packets of energy called photons. The photons are absorbed by electrons and increase the energy of the electrons. Some of the electrons become so energetic that they escape from the metal. In other words electrons are emitted from the metal, producing a current that is amplified by the photometer. The current goes through a resistor in the photometer. Ohm's law (V=IR) tells us that current I going through a resistor R is associated with a voltage drop V. The DMM measures the voltage drop across the resistor. Saturation occurs when the metal emits the maximum flux of electrons that it can produce. (Or it may be the maximum amplification of the photometer.) What does a photometer do?
a.It emits sound.
b.It emits light.
c.It converts light into electric current.
d.It measures the frequency of light.
Physics
1 answer:
dimaraw [331]3 years ago
8 0

Answer:

It converts light into electric current.

Explanation:

The first line of the description says that the photometer is a device that converts light to voltage. if the voltage can be measured then current flowing through it can be calculated by Ohms law V=IR.

<em>Hence the photometer converts light to electric current.</em>

The photometer is used to measure the strength of electromagnetic radiation falling on it and operate within the range of ultraviolet ,visible and infrared spectrum.

It converts light to electric current using photodiode (pn junction),photoresistor and photmultiplier.

 

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Two particles are traveling through space. At time t the first particle is at the point (−1 + t, 4 − t, −1 + 2t) and the second
Pie

Answer:

Yes, the paths of the two particles cross.

Location of path intersection = ( 1 , 2 , 3)

Explanation:

In order to find the point of intersection, we need to set both locations equal to one another. It should be noted however, that the time for each particle can vary as we are finding the point where the <u>paths</u> meet, not the point where the particles meet themselves.

So, we can name the time of the first particle T_F ,  and the time of the second particle T_S.

Setting the locations equal, we get the following equations to solve for T_F and T_S:

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(4 - T_F) = (-6 + 2T_S)                        Equation 2

(-1 + 2T_F) = (-1 + T_S)                     Equation 3

Solving these three equations simultaneously we get:

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Since, we have an answer for when the trajectories cross, we know for a fact that they indeed do cross.

The point of crossing can be found by using the value of T_F or T_S in the location matrices. Doing this for the first particle we get:

Location of path intersection = ( -1 + 2 , 4 - 2 , -1 + 2(2) )

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