Ultraviolet (UV)
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Physics for Scientists and Engineers: Foundations and Connections
- Quantum Dot: Patent number 60-985-841 is for a quantum dot that only emits and absorbs three wavelengths of light. The quantum dot is engineered to have three different electron energy levels: E₁=0.60 eV, E₂ = 2.53 eV, and E3 = 4.15 eV. The quantum dot contains a electron. single What is the minimum wavelength of light will this quantum dot will absorb and emit? Report your result in nanometers (nm).arrow_forwardThe eyes of some birds contain cells that detect ultraviolet (UV) light.UV light is reflected by some fruits and the urine of small mammals.Explain how birds that detect UV light have evolved from birds that could not detect UV light? This was a past GCSE paper question. I have already answered the quesiton as practice, but I can't find the mark scheme. Could you provide an answer which I can then use to check if my answer was correct?arrow_forwardWhy do farmers use Infrared lights and UV lights?arrow_forward
- I am having trouble finding the exponent for the question: What is the wavelength of a gamma ray with a frequency of 1.0 x 10 ^19 Hz? (c = 3.0 x 10 ^8 m/s ? x 10 ^ ? = m I know the first question mark is a 3, but cannot for the life of me figure out the exponent. I thought it was -9 but have been told it was incorrect. Any help would be appreciated.arrow_forwardSome insects, like bees, can see light of shorter wavelengths than humans can see. What kind of radiation do you think a bee sees?arrow_forwardA distant star has a peak wavelength of 0.00000049. What is the temperature of that stararrow_forward
- What is the wavelength of gamma radiation with a frequency of 3.75 x 1020 Hz ? What is the energy of the gamma radiation?arrow_forwardIn a LASER, the energy of the emitted light comes from: a) The thermal energy of the active material which emits the laser light. b) The binding energy of the nuclei in active material which emits the laser light. c) The pumping beam.arrow_forwardBe sure to answer all parts. (a) What is the wavelength (in nm) of radiation that has an energy content of 2.43 × 10³ kJ/mol x 10 (b) In which region of the electromagnetic spectrum is this radiation found? nm gamma ray visible microwave radio wave X-ray infrared ultravioletarrow_forward
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- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning