... vitalumiÈre glow luminous touch foundation hydration and comfort spf 15 starting from £34.00. I want to use it for microbial inactivation. I am currently working on UV sanitation system. False (b) Centimetre (b) A number and a unit, Question 3. Correct statement: But do I have mercury line here? (of course this is intended for the same exposure time). (b) Fahrenheit Measure Ambient Light … A computational simulation of reflector and tube, effects in ultraviolet phototherapy, Phys. The device’s large OLED display provides both numerical and graphical … Which one the following system of units is the British System of unit? where SR is a constant that is easily experimentally determined. Your email address will not be published. I have a UV light tube of 30 Watt. False (d) Approximation False Question 5. > What is the difference between the luminous intensity and brightness of light (and all other types of electromagnetic radiations)? Heat is a physical quantity that expresses the degree of hotness or coldness of a substance. …of UV lamps, with a unique built-in position device which automatically protects operators from exposure to UV radiation. Answer: The measure of the power of the emitted light, by a light source in a particular direction, per unit solid angle is called as luminous intensity. and different types of other complex formula  that I don't quite understand). Question 1. Which one of the following devices is used to measure … Name the British system of units. (ii) 100 Answer: The basic way to calculate UV dose from a UVC 15Watt bulb? Wavelength is 254 nm? Contents: - Effect of Ultraviolet - UV-C Production - Ultraviolet Dose - Dose/Destruction Relationship - Applications - Medium and High Pressure Arc Tubes - Low Pressure Lamps - Irradiation Chambers - Single Arc Tube Configuration - UV Intensity … Give the name of the instrument used for the measurement of temperature. Luminous Intensity is the amount of visible light, that is emitted in unit area per unit ……………. Analog clock and digital clock. It has three hands to show the time. (d) Integrated symbol of units Given that a UV bulb with 2x15 Watt, wavelength of 365nm, the intensity at 15cm is 2300uW/cm2. Define – ampere. Or the distribution of wavelengths and frequencies. Would the Wattage of a bulb (whether UV or normal lights) be the maximum radiant intensity the bulb has? Question 4. 2. I = 0.25 A, Question 4. Name some common systems of measurement. (c) Quintal Production UV-LED sources have their spectral emissions somewhere in the 365 to 405-plus nm region. Which one of the following devices is used to measure electric current The intersection of two straight lines gives us ………………. Convert 90° C into radian. Answer: (i) 0° C Reason : Avogadro’s number is a constant. Lumen. Answer: From your data you can calculate the radiant intensity for the specific direction and then recalculate for the necessary distance. Joahnna, is 15W the electrical power of the lamp or optical? If a light source emits light with equal intensity towards all directions, total luminous flux emitted by the light is. Improved Safety with LEDs: Safety is perhaps the most often overlooked advantage when it comes to LED lighting.The number one hazard when it comes to lighting is the emission of heat. This value is the intensity at (15cm) and the intensity change with the distance. (b) Precision UV A light source (365nm, 8 watts) Aimed at a surface 5 cm away for 7 Days, UV B light source (302nm, 8 watts)Aimed at a surface 5 cm away for 7 Days, UV C light source (254nm, 8 watts)Aimed at a surface 5 cm away for 7 Days. Minutes Hand : It is long and thin. (c) Metre Différent types of clocks based on working mechanism: Question 1. Sun intensity refers to the amount of incoming solar energy that reaches the Earth. The SI standard for candela, the unit of measure for luminous intensity is … (a) Supplementary quantities Mention its SI unit and symbol. (c) A number Average Luminous Intensity Mean Spherical Candle Power. Question 10. How to calculate the UV dose from mW/cm2, time, disance and the surface of the irradiated area? Figure 4. True. (c) kelvin, Question 4. The frequency of a vibrating crystal is very precise. Correct explanation : Temperature is a measure of the average ……………. It is not possible of 100°C fever. Luminous intensity is the intensity of (a) Laser light (b) UV light (c) Visible light (d) IR light Answer: (c) visible light. If the detector and source are not directly inclined, and there is some surface normal angle, then this matters in irradiance calculations and the above equation becomes slightly more complicated; as Researchgate doesn't allow me to use nice math formatting I won't put it here but I will link you to some papers where we derive and use it; the model works within 1% for UVR irradiance at any orientation and if you're using UV lamps I'd suggest you give it a read - I'm more than happy to answer any questions you might have on it, hope it helps! Answer: Reason : They are independent of each other. The shorter the distance the bigger the discrepancies between the data calculated according to this law and measured. How many base quantities are there? Answer: Answer: Question 5. Answer: Answer: Solution: 1. Using a light (lux) meter is the best way to measure light intensity – it gives us the ability to choose the optimal light intensity for an environment. = -173° C, Question 3. Difference between Plane Angle and Solid Angle: K = C + 273 Question 7. VI. Question 10. One coulomb of charge flowing per minute is called ‘ampere’. When i check for Uv-C lamp providers their data is given in UV output ( in Watts ) but for selection of suitable lamp, i will need data of UV Irradiance ( watts sec / cm2) . What is luminous Intensity? Example: VL-215.L with emitted wavelength of 365 nm (it means each photon has energy of E = 3.4 eV  or 5.44E-19 Joule. Correct explanation : Answer: SI unit of electric current is ‘ampere’ and it is denoted as A. True, Question 1. 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