Visible Light Spectrum

There are 7 main colours but are normally the 7 colours that are always used.

1.Red

2.Orange

3.Yellow

4.Green

5.Blue

6.Indigo

7.Violet (not called purple because that's the way it is in this case)

To remember all there colours easily with the Acronym (ROY G. BIV)

When any element is excited to the point where it emits visible light, it emits a unique spectrum. The mercury in a florescent lamp emits a spectrum in the ultraviolet spectrum. It excites phosphorus powder on the inside of the bulb. The ultraviolet rays strike the phosphorus and it emits white light. Sodium emits yellow light. Potassium emits purple light. Sodium actually emits two different yellows. Each element emits several different colors.
The above is not wrong, but it doesn't really answer the question. I believe the answer the poster was looking for is emission spectrum.


You may be correct. I have no intention of giving the emission spectrum of every element. I only wished to help the questioner understand what happens when an emission spectrum is produced. I had the idea that the questioner had the idea that every element produced the same emission spectrum. We interpreted the question differently.

In order to "see" something with eyes, the object must be longer than the light wave refracted from it. Molecules are too small to be refracted.

Visible light plays a crucial role in regulating our circadian rhythm, which affects our sleep-wake cycle and overall well-being. Exposure to natural light during the day can help improve mood, alertness, and productivity. However, excessive exposure to artificial light, especially blue light from screens, before bedtime can disrupt sleep patterns.

frequency = 1/s

c = m/s

lambda = m (wavelength)

c/lambda m/s/m= frequency 1/s

300,000E9mm/s / 300nm > 300,000E9nm/s / 500nm

So no, the shorter the wavelength, the higher the frequency. This is why very small waves such as gamma waves are very dangerous; they have a very high frequency compared to feet long waves such as Radio waves.

A light spectrum that is not continuous is called a discrete or discontinuous spectrum. This means that instead of a smooth progression of colors, there are distinct individual colors or wavelengths present in the spectrum.

They are the bluest ones, i.e. the last color you can see at the blue end of the rainbow or visible spectrum.

The wavelenghth is about 390 but the exact end is different for each individual's eyes.

It is electromagnetic radiation, which is the same in composition as visible light but has a much higher frequency/shorter wavelength, and will do damage to any biological material it passes through. Both travel at the same speed ('velocity of light') but gamma radiation can penetrate material opaque to visible light.

We see color in the electromagnetic spectrum because different wavelengths of light correspond to different colors. Our eyes have specialized cells called cones that are sensitive to different wavelengths of light. When light enters our eyes, the cones are activated, sending signals to our brain that allow us to see and interpret colors. Ultraviolet, infrared, X-rays, and gamma rays are outside the visible spectrum, so we cannot see them as colors, but rather, we use specialized sensors or equipment to detect and interpret them.

A hot, glowing wire emits all wavelengths (or colors) of light. This is sometimes called "blackbody radiation." Since all colors are present, you will get a continuous spectrum.

The first color is red and the last color is violet. The visible spectrum of light ranges from longer wavelengths (red) to shorter wavelengths (violet), with colors like orange, yellow, green, and blue in between.

No, candle light does not have a continuous light spectrum. It produces a continuous spectrum with missing colors due to absorption by the flame and emission from soot particles, resulting in a warm, orange-yellow color.

We know that ultraviolet light, X-rays and gamma rays have wavelengths shorter than visible light.

Red light has the longest wavelength in the visible spectrum.

Red and blue light will not absorb the same light. Red objects reflect red light and absorb other colors, while blue objects reflect blue light and absorb other colors.

Refraction of light rays occurs when light passes through a medium with a different optical density, such as glass, causing the light rays to change direction. This bending of light rays is due to the change in speed of light as it moves from one medium to another.

Electric and magnetic fields which are perpendicular to each other and oscillate perpendicular to the direction of propagation. This forms electromagnetic waves that carry energy and information.

The visible light emitted by the Sun originates from the photosphere, which is the outermost layer of the Sun's atmosphere. This is the layer that we see when we observe the Sun from Earth.

A prism or a diffraction grating can be used to spread visible light into a spectrum. These optical components work by causing the different colors of light to bend by varying amounts, producing the characteristic rainbow pattern.

Chlorophyll appears green because it absorbs red and blue light while reflecting green light. This pigment is essential for photosynthesis in plants, allowing them to convert light energy into chemical energy. Its selective absorption of light wavelengths gives plants their characteristic green color.

Blue light provides the best resolution in a microscope because of its shorter wavelength compared to other colors in the visible light spectrum. The shorter wavelength allows for greater detail and resolution when viewing microscopic specimens.