Which are photosensitive materials?
Solution : (i) Metals like cadmium, zinc, magnesium, alkali metals lithium , sodium, caesium respond to visible light. (ii) The materials which eject photoelectrons upon irradiation of electronmagnetic wave of suitable wavelength are called photosensitive materials.
What is a photosensitive material give an example?
Solution : Examples of photosensitive substances are Li, Na , K , Rb and Cs etc. The work function of alkali metals is very low. Even the ordinary visible light . Alkali metals can produce photoelectric emission . Hence they are called photosensitive substances .
Which is the most photosensitive material?
Solution : Alkali metals have small work function. So even with a radiation of small energy, electrons can be ejected out of their surface. That is why alkali metals are most suitable for photoelectric emission.
How do photosensitive materials work?
The principle of photosensitivity relies on the exposure of a material with energy larger than its bandgap. The linear (or non-linear) interaction generates a change of the material structure that induces a local refractive index change. The mechanisms of the photosensitivity can be multiple.
What are photosensitive metals?
Photosensitive metals possess a quality that make them react to visible light in such a way that creates images on the metal’s surface. This quality is used to create nametags, nameplates, portraits on metals and other metal items.
What is a photosensitive element?
Photosensitive elements particularly suitable for use in diffusion transfer photographic film units which include a plurality of essential layers including at least one photosensitive silver halide layer having associated therewith a dye image-forming material which is diffusible during processing as a function of the …
What is photosensitive metal?
What is the composition of photosensitive glass?
Photosensitive glass contains microscopic metallic particles. These microscopic metallic ion nanoparticles are made of gold or silver which is responsible for the refractive index change. Photosensitive glass is similar to photographic film.
What is photosensitive surface?
Answer: A material that changes its chemical composition when exposed to electromagnetic radiation. Note: Examples of photosensitive materials are (a) the material on the surface of an optical disk prior to recording data on it and (b) the coating on unexposed photofilm used in cameras.
What is photosensitive plate?
These plates are sometimes called metal photo plates for the simple reason that the images on these are produced the same way printed photos are produced (in the old fashioned way).
Which of the following is photosensitive element in Group 16?
Name the two elements of group -16 which are metalloids and photosensitive. Get Answer to any question, just click a photo and upload the photo and get the answer completely free, UPLOAD PHOTO AND GET THE ANSWER NOW! Solution : Selenium (Se) and tellurium (Te).
Are skin cells photosensitive?
Highlights. Skin has a photosensitive system similar to the one found in the eye. Photosensitive molecules in the skin include biomolecules, endogenous chromophores, pigments and opsins. The effects of sun exposure on the skin result from the interaction of photons with photosensitive molecules.
Which of the following is true for photosensitive metal?
The correct answer among the given choices is OPTION C: Same photosensitive substances give a different response to lights of different wavelengths. The work function of photosensitive substances is extremely low. The chemical constitution of a substance changes when it is exposed to electromagnetic radiation.
What is the applications of lead glass?
The most common uses of lead crystal glass are drinking glasses, ornaments, decanters, jewellery, optical lenses, enamels and lacquers, glass sealants and solders and radiation shielding from gamma and x-rays. The wide scope of applications is made possible by the physical, chemical and mechanical properties of lead.
What is the meaning of photosensitivity?
(FOH-toh-SEN-sih-TIH-vih-tee) A condition in which the skin becomes very sensitive to sunlight or other forms of ultraviolet light and may burn easily. Photosensitivity usually causes a rash or sunburn, especially on areas of the skin that are exposed to ultraviolet light.
What is photosensitive printer?
The printer has an X-Y resolution of 47 microns and applies layer thicknesses of 20-100 microns, the company said. It uses LCD technology to print with photosensitive resins that change physical properties and become solid when exposed to light.
What is the most reactive element of group 16?
Oxygen
Oxygen is the periodic table’s most reactive portion. In the periodic table, it is the second most electronegative product, making it the group’s most reactive. The oxygen group is sometimes called group 16 elements of the periodic table.
What are the different types of photosensitivity?
Photosensitivity refers to various symptoms, diseases, and conditions (photodermatoses) caused or exacerbated by exposure to sunlight[1]. It is classified into five categories: primary photodermatosis, exogenous photodermatosis, photo-exacerbated dermatoses, metabolic photodermatosis, and genetic photodermatosis.
What is meant by photosensitivity?
Listen to pronunciation. (FOH-toh-SEN-sih-TIH-vih-tee) A condition in which the skin becomes very sensitive to sunlight or other forms of ultraviolet light and may burn easily. Photosensitivity usually causes a rash or sunburn, especially on areas of the skin that are exposed to ultraviolet light.