A substance that prevents the flow of electric current is a(n) .

Chemistry

2 answers:

Dmitriy789 [7]3 years ago

6 0

Answer:

Insulator

Explanation:

An insulator does not conduct electricity. Insulators offer high resistance to the free flow of electron. Rubber is a good insulator.

A conductor conducts electricity. Metals are good conductors of electricity. Metals have free flowing electrons that allow them to conduct electricity. As metals conduct electricity they have a distribution of charge on its surface.

nasty-shy [4]3 years ago

4 0

An Insulator.

Insulators prevent flow of electric current. Example is wood, clay.

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In IR spectroscopy, we normally talk about "frequencies" when in reality we are referring to wavenumbers. What is the mathematic

Svetach [21]

Answer:

Here's what I get.

Explanation:

(b) Wavenumber and wavelength

The wavenumber is the distance over which a cycle repeats, that is, it is the number of waves in a unit distance.

$\bar \nu = \dfrac{1}{\lambda}$

Thus, if λ = 3 µm,

$\bar \nu = \dfrac{1}{3 \times 10^{-6} \text{ m}}= 3.3 \times 10^{5}\text{ m}^{-1} = \textbf{3300 cm}^{-1}$

(a) Wavenumber and frequency

Since

λ = c/f and 1/λ = f/c

the relation between wavenumber and frequency is

$\bar \nu = \mathbf{\dfrac{f}{c}}$

Thus, if f = 90 THz

$\bar \nu = \dfrac{90 \times 10^{12} \text{ s}^{-1}}{3 \times 10^{8} \text{ m$\cdot$ s}^{-1}}= 3 \times 10^{5} \text{ m}^{-1} = \textbf{3000 cm}^{-1}$