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2 years ago

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Compared to the resistivity of a 0.4-meter length of 1-millimeter-diameter copper wire at 0 degrees Celsius, the resistivity of

a 0.8-meter length of 1-millimeter-diameter copper wire at 0 degrees Celsius is: *

2 answers:

Ierofanga [76]2 years ago

4 0

Answer:

c) the same

Explanation:

Mazyrski [523]2 years ago

3 0

Answer:

Resistivity of both wires are same

Explanation:

Length of one wire, $l_1=0.4 m$

Diameter, $d_1=1mm$

Radius, $r_1=\frac{d_1}{2}=\frac{1}{2}mm=0.5\times 10^{-3} m$

$1mm=10^{-3} m$

$l_2=0.8 m$

$d_2=1mm$

$r_2=0.5\times 10^{-3} m$

Temperature in each case is same.

Area of each wire, $A_1=A_2=A=\pi r^2=\pi (0.5\times 10^{-3})^2m^2$

Resistivity is the property of material due to which it offers resistance to the flow of current.

Resistivity of material depends upon the temperature and material by which it is made.

It does not depends upon the length of object.

Therefore, the resistivity of both wires of different length are same.

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Answer:

First Question

$E = 1.065*10^{-12} \ J$

Second Question

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Explanation:

From the question we are told that

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Here h is the Planck's constant with value $h = 6.62607015 * 10^{-34} J \cdot s$

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So

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Generally the energy of the photon emitted is also mathematically represented as

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