All categories

3 years ago

How does light energy work

Physics

2 answers:

OLEGan [10]3 years ago

6 0

Answer:

Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.

Explanation:

larisa [96]3 years ago

4 0

<u>Now What is light?</u>

-Light ( or light energy ) is defined as a form of electromagnetic radiation and a type of kinetic energy.

-Light is made up of photons. Photons is the basic unit of light. They are produced when an object's atom is subjected to heat. The more the atoms are heated, the more photons are created.

-Light travels in the form of a wave but it does not require any medium for transmission.

-Light travels so fast, nothing is faster than it. It travels at a constant speed of 186,282 miles/sec ( 300,000 km/sec ) in vacuum and whether the source is moving or stationary.

-Light can be measured in either joules, calories ( energy units ), quanta and einsteins ( quantum units ). Conversion from one unit to another heavily depends on wavelength.

Now an unaided human eye can only see the visible light, namely red, orange, yellow green, blue, indigo and violet (Roy G Biv) but light also comes in other forms that we cannot see, they are named, radio wave, microwave, infrared, ultraviolet, x-ray and gamma ray.

You might be interested in

Help needed pls and thxs

algol13

Erosion:
A.) Is the same as weathering

3 0

4 years ago

A violin string has a length of 327mm and produces a note of frequency 440Hz.

Scorpion4ik [409]

The characteristics of the standing wave we can find the backlash for the frequency of the wave when the string is shortened is:

The new frequency is f = 657 Hz

<h3>How is a standing wave produced?</h3>

A standing wave is produced when a traveling wave meets an obstacle and bounces, the sum of the two waves results in a wave that does not propagate in space.

In the event that the obstacle is a fixed point, there is a node at this point. The expression for the length of the standing wave.

L = $\frac{\lambda }{2}$ fundamental frequency

L = $2 \frac{\lambda}{2}$ second harmonic

L = $3 \frac{\lambda}{2}$ third harmonic

L = $n \frac{\lambda}{2}$ general term.

Where L is the length of the chord, lan the wavelength and n an integer.

Wave speed is related to wavelength and frequency.

v = λ f.

Let's substitute.

v = $\frac{2L}{n}$

They indicate that initially the string has a length of L₀ = 327 mm= 0.327m and the frequency is f₀ = 440 Hz.

v n = 2L₀ f₀

v n = 2 0.327 440

v n = 287.76

They indicate that the tension on the string do not changes and the speed of the wave depends only on the tension and the density of the string, therefore it is constant, we assume that the harmonic does not change either, therefore the new length.

v n = 2 L f

Let's substitute.

287.76 = 2 L f

f = $\frac{287.76x}{2L}$

Let's calculate.

f = $\frac{287.76}{2 \ 0.219}$

f = 656.99 Hz

In conclusion with the characteristics of the standing wave we can find the backlash for the frequency of the wave when the string is shortened is: