Light questions This is a list of recently added questions about light. Play light quiz and see all the questions. How far away did the lightning strike if it took 3 seconds to hear the thunder?Approx. 1 km. Sound travels through air at 331.2 meters per second, so after 3 seconds it would travel approximately 1 kilometer.Created by: Ninjaivery hard 32% approx. 0.3 kmapprox. 0.3 km77approx. 1 kmapprox. 1 km239approx. 3 kmapprox. 3 km323approx. 9 kmapprox. 9 km93weather riddles » What type of plasma is Sun composed of?Hot. The Sun is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. Hot plasmas (thermal plasmas) have electrons and the heavy particles at the same temperature, i.e. they are in thermal equilibrium with each other. Cold plasmas (nonthermal plasmas) on the other hand have the ions and neutrals at a much lower temperature, whereas electrons are much "hotter".Created by: Ninjaihard 40% coldcold497hothot1858ultracoldultracold920none of the abovenone of the above1270Sun riddles » What is the unit of measure of the luminous flux in the SI system?Lumen. The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source Created by: Tschukahard 45% LuxLux215LumenLumen432CandelaCandela254IlluminanceIlluminance58physics riddles » Which of the following is the worst for eyesight during a sunny day?Wearing sunglasses without UV filter. Wearing sunglasses witout UV filter causes the pupils to dilate and eyes to absorb more UV rays than they normally would without the sunglasses. Hence, it's much better not to wear sunglasses at all, than to wear ones without UV filter.Created by: Ninjaihard 47% wearing sunglasses with UV filterwearing sunglasses with UV filter419wearing sunglasses without UV filterwearing sunglasses without UV filter5227not wearing sunglasses at allnot wearing sunglasses at all3921wearing sunglasses inside buildingswearing sunglasses inside buildings1375optics riddles » In what process sky colors (including blue sky and red sun) are created?Rayleigh scattering, named after the British physicist Lord Rayleigh (John William Strutt), is an elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation. Created by: Ninjaivery hard 33% iridescenceiridescence625Rayleigh scatteringRayleigh scattering1772miragemirage640atmospheric refractionatmospheric refraction2274optical illusions riddles » Which color has the greatest albedo?White. Albedo in Latin is simply "whiteness". It is the reflecting power of a surface - the ratio of reflected radiation from the surface to incident radiation upon it.Created by: Paweł Kołodziejczykhard 47% whitewhite3292blueblue1082redred1725blackblack891Latin riddles » What is "c" in E=mc^2?Speed of light. In words, energy equals mass multiplied by the speed of light squared.Created by: Paweł Kołodziejczykeasy 71% thermodynamic free energythermodynamic free energy902specific heat capacityspecific heat capacity1138speed of lightspeed of light6536Coulomb, unit of the electric chargeCoulomb, unit of the electric charge505discoverers riddles » What kind of building is that?Solar power plant. In The PS10 Solar Power Plant, 624 movable mirrors concentrate the sun's rays to the top of a 115 meter (377 ft) high, tower where a steam turbine is located. The plant is located near Seville, Spain.Created by: globalquiz.orgaverage 64% superlighthousesuperlighthouse2356solar power plantsolar power plant9838tent-type greenhousetent-type greenhouse1095a fountain in Dubaia fountain in Dubai1849electricity riddles » Which beverage is is fluorescent in UV light?Tonic water is transparent in daylight. Under ultraviolet light, the quinine makes it fluorescent (pictured), even though it is present in a negligible concentration.Created by: Luca Biaggihard 52% SpriteSprite3132milkmilk1853tonic watertonic water7329pineapple juicepineapple juice1749beverages riddles » The rainbow is violet on the inside of its arc. What color is it on the outside?Red. Visible light spans from red to violet. It is easy to remember, since wavelengths just outside the visible range are called infrared and ultraviolet.Created by: Hà Linh Chihard 55% blueblue3306greengreen1905yellowyellow3991redred11688colors riddles » Play light quiz and see all the questions.