Which statement best describes light, whether polarized or unpolarized?

Physics

2 answers:

marshall27 [118]3 years ago

6 0

The best choice would be letter C hope this helps

alexira [117]3 years ago

6 0

Answer:

C. light in which the electric and magnetic vectors oscillate perpendicular to the direction of propagation of the wave

Explanation:

Light is an electromagnetic wave in which electric field vector and magnetic field vector both oscillates perpendicular to each other and also these two components are perpendicular to the propagation of wave.

As we know that the direction of velocity of wave is given by the formula

$\vec E \times \vec B = \vec v$

so here the velocity vector must be perpendicular to vector E and vector B

so here correct answer will be

C. light in which the electric and magnetic vectors oscillate perpendicular to the direction of propagation of the wave

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Two concrete spans of a 380 m long bridge are

Mazyrski [523]

Answer:

4.163 m

Explanation:

Since the length of the bridge is

L = 380 m

And the bridge consists of 2 spans, the initial length of each span is

$L_i = \frac{L}{2}=\frac{380}{2}=190 m$

Due to the increase in temperature, the length of each span increases according to:

$L_f = L_i(1+ \alpha \Delta T)$

where

$L_i = 190 m$ is the initial length of one span

$\alpha =1.2\cdot 10^{-5} ^{\circ}C^{-1}$ is the temperature coefficient of thermal expansion

$\Delta T=20^{\circ}C$ is the increase in temperature

Substituting,

$L_f=(190)(1+(1.2\cdot 10^{-5})(20))=190.0456 m$

By using Pythagorean's theorem, we can find by how much the height of each span rises due to this thermal expansion (in fact, the new length corresponds to the hypothenuse of a right triangle, in which the base is the original length of the spand, and the rise in heigth is the other side); so we find:

$h=\sqrt{L_f^2-L_i^2}=\sqrt{(190.0456)^2-(190)^2}=4.163 m$