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_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_forwardWhat causes UVC can to kill viruses? Is it because of the wavelength? if so, how is the UVC wavelength related to the virus?arrow_forward
- Why do farmers use Infrared lights and UV lights?arrow_forwardI 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_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_forward
- A distant star has a peak wavelength of 0.00000049. What is the temperature of that stararrow_forwardWhat is the wavelength of gamma radiation with a frequency of 3.75 x 1020 Hz ? What is the energy of the gamma radiation?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
- Part 1 Find the speed an alpha particle requires to come within 4 x 10-14 m of a gold nucleus. Coulomb's constant is 8.99 x 109 Nm2/C2, the charge on an electron is 1.6 × 10-19 C, and the mass of the alpha particle is 6.64 x 10-27 kg. Answer in units of m/s. Part 2 Find the energy of the alpha particle. Answer in units of MeV.arrow_forward4. A company manufactures LED light bulbs. The lifetime for these bulbs is 4,600 hours with a standard deviation of 250 hrs. What lifetime should the company promote for these bulbs, so that only 4.0% of them burnout before the claimed lifetime?arrow_forwardCan you solve the question? Given: - Power per unit area emitted at the solar surface = 6.41 x 10^7 W/m^2 - Total power radiated by the solar surface = 3.906 x10^26 watts - Solar power per unit area = 1381.465 W/m^2 - solar radius = 6.96 x 10^5 km - Mean distance from the sun to the Earth = 150 x 10^6 km - Earth radius = 6371 kmarrow_forward
- 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