3) EM waves also exert pressure, which is shown by a radiometer. One side of the panels is black, the other side is white, and the panels spin due to the pressure differences under the light.

Question 5: A ray from the sun, passing through your kitchen window, hits a prism that casts a rainbow on the windowsill. Supposedly, there is a hand-held radiometer on the table. Now, you place the instrument on a specific colour of the rainbow with your eyes closed. When you open your eyes, you see that the radiometer measured the energy from that colour at 4.0 x 10-19 joules. If we take Planck’s constant of 6.6256 x 10-34 joules/sec, what possible colour did the instrument measure? How can we determine this?

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Radio waves have the lowest frequency and, hence, have the least energy. E = hf E = Energy f = Frequency h = Planck’s constant

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The electromagnetic spectrum consists of a span of all electromagnetic radiation which further contains many subranges, which are commonly referred to as portions. These can be further classified as infrared radiation, visible light or ultraviolet radiation.

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Nonetheless, the main significance of the electromagnetic spectrum is that it can be used to classify electromagnetic waves and arrange them according to their different frequencies or wavelengths.

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The entire range (electromagnetic spectrum) is given by radio waves, microwaves, infrared radiation, visible light, ultra-violet radiation, X-rays, gamma rays and cosmic rays in the increasing order of frequency and decreasing order of wavelength. The type of radiation and their frequency and wavelength ranges are as follows:

As for the word “photography”, it is derived from the Greek words - phos and graphis. In Greek, phos means light while graphis means drawing. When the two words combined as “photography”, it can be defined as “drawing with light”. The significance of photography is about capturing and recording light in the form of paper or digital format.

Infrared: It is used widely in night vision goggles. These devices can read and capture the infrared light emitted by our skin and objects with heat. In space, infrared light helps to map interstellar dust.

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Answer: No, X-rays and gamma rays are short-range. Moreover, they are harmful and have penetrating power on the matter with which they interact and can damage the tissues of living bodies.

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What does illumination means? When a light source is poured onto the objects, they reflect light that can been perceived by human eyes. What illumination means is the act of using this light source. Illumination is commonly seen, for example lighting in rooms or task lighting on desks.

The electromagnetic waves in these different bands have different characteristics depending upon how they are produced, how they interact with matter and their practical applications. Maxwell’s equations predicted the existence of an infinite number of frequencies of electromagnetic waves, all travelling with the speed of light. This is the first indication of the existence of the entire electromagnetic spectrum.

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This falls within the given visible spectrum frequencies. Being a high frequency on the visible spectrum, close to the frequencies emitted by blue colour, one could assume that you measured a colour close to blue, though cyan and green cannot be out of  question as the given frequencies are a bit vague. It is closest to the green colour. Hence, we measured the green colour.

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Microwave: This type of radiation is found in microwaves and helps in cooking at home/office. It is also used by astronomers to determine and understand the structure of nearby galaxies and stars.

Polarization of light refers to the phenomenon where the oscillations of light waves are restricted to a particular plane.

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Radio: A radio basically captures radio waves that are transmitted by radio stations. Radio waves can also be emitted by gases and stars in space. Radio waves are mainly used for TV/mobile communication.

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We can learn about a substance by analysing the EM spectrum given by it. When light scatters or passes through matter, it tends to interact with molecules and atoms. Since atoms and molecules have resonance frequencies, they directly interact with those light waves having the exact frequencies. When collisions occur in an excited state, the atoms and molecules emit light with a certain set of characteristic frequencies. This further results in a line spectrum. Here, only light with detached wavelengths is produced. The spectrum is also not continuous, but it consists of a set of emission lines.

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In cases where light with continuous wavelengths passes through a low-density material, the atoms and molecules of the material will absorb light waves with the same set of characteristic frequencies. This results in the production of the absorption spectrum, which is a nearly continuous spectrum with missing lines.

An electromagnetic spectrum is a collection of a range of waves in sequential order. Radio waves have the highest frequency, and gamma rays have the shortest wavelength.

You can see this figure when you check the spec list of a video light. For example, the COLBOR CL220 LED constant light for photography offers 105000 lux of 5600K at 1 meter. It is 25% brighter than the similar fixtures on the market.In the case of illumination company, both illumination and illuminance are meant to show the same property of light. For instance, “illumination” is used for COLBOR video lights to indicate the illuminance. Here are the figures:

The electromagnetic spectrum is a range of frequencies, wavelengths and photon energies covering frequencies from below 1 hertz to above 1025 Hz, corresponding to wavelengths which are a few kilometres to a fraction of the size of an atomic nucleus in the spectrum of electromagnetic waves. Generally, in a vacuum, electromagnetic waves tend to travel at speeds which is similar to that of light. However, they do so at a wide range of wavelengths, frequencies and photon energies.

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Ultraviolet: The Sun is the main source of ultraviolet radiation. It causes skin tanning and burns. Hot materials that are in space also emit UV radiation.

X-ray: X-rays can be used in many instances. For example, a doctor can use an X-ray machine to take an image of our bones or teeth. Airport security personnel use it to see through and check bags. X-rays are also given out by hot gases in the universe.

Gamma-ray: It has a wide application in the medical field. Gamma-ray imaging is used to see inside our bodies. Interestingly, the universe is the biggest gamma-ray generator of all.

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● The radio waves and microwaves discovered by Hertz paved the way for wireless television, radio and mobile communication.

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● The visible light portion of the electromagnetic spectrum is the reason for all visual aids in daily life. This is the portion of the electromagnetic spectrum that helps us to see all objects, including colours.

Illumination can render emotions and atmosphere. Understanding what does illumination mean can help photographers to capture many different types of emotions in photos. The good illumination produced by well-positioned and good-quality light will change the photography.

Visible light falls in the range of the electromagnetic spectrum between infrared rays and ultraviolet rays. It has frequencies of about 4 × 1014 to 8 × 1014 hertz (Hz) and a wavelength of about 740 nanometers ( 2.9 × 10−5 inches) to 380 nanometers (1.5 × 10−5 inches).

We should use the equation involving energy change, Planck’s constant, and frequency. Next, we need to figure out what we are solving for. In this problem, they ask for the possible colour that you measured. If we relate the energy with Planck’s constant, we can solve for frequency. We are given the energy, 4.0 x 10-19 joules, as well as Planck’s constant, 6.6256 x 10-34 joules/sec. Also, we are given the frequencies emitted by the visible spectrum, from red to violet. This problem is easy to solve now. If we solve for the frequency, we can then relate it to the energy emitted, measured in either sec-1.

The electromagnetic spectrum, in simple terms, is defined as the range of all types of electromagnetic radiation. We shall learn about the concept in detail and understand all its underlying aspects in this lesson.

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In photography, light is of the greatest importance, for the reason that illumination is the result from it. When taking pictures without light, it will only creates a photograph of complete blackness. However, with lighting, everything taken place will be illuminated. It is now then the photograph will actually present something. Therefore, the illumination given by light and the light itself are required for both human eye and the camera. To further define illumination, the illumination of scenes to be taken shots is called photographic lighting. Unlike photograph, which only records structure of color, light and shade, lighting focuses wholly on having control over the image. Illumination aims at the accurate reproduction of the scene, while considering the control of brightness, color and direction. Light and illumination are the fundamental features of photography. The genre of lighting, also the type of illumination that are being used is one of the most essential factors of photo when concerning photography. In photography, light means how the light source - natural or artificial - is placed in accordance with the subject. Both the position and the quality can be the causes affecting tone, atmosphere, mood as well as brightness and darkness. When making photography of portrait, still life or landscape, it is up to the characteristics of the subject, and the expected way of portraying in the photos that which lighting to choose, also how much illumination to get. Let’s take soft and hard lights as an example. The hard light puts emphasis on angles and rough surface while the soft one smooths these features.

What is illumination of light? As aforementioned, illumination is the property and effect of light in an observable form, presenting the use of light sources. By contrast, illuminance measures how much luminous flux is spread over a given area. Luminous flux, which is measured in the unit of lumens, can been considered as the measurement of how much visible light present in total while the illuminance as the measurement of illumination intensity on the surface.

Answer: X-rays can be used to detect medical ailments and bone deformities in medical diagnosis. They are useful for ionisation purposes also.