1. [l1 Points] DETAILS OSCOLPHYSZO16 29.1.WA.001. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The radiation emitted by a heat source reaches its peak wavelength at 8.09 pm. Determine the temperature (in Celsius) of the source. C Additional Materials II] Reading 2. [-l1 Points] DETAILS OSCOLPHYSZO16 29.1.P.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A physicist is watching a 15kg orangutan at a zoo swing lazily in a tire at the end of a rope. He (the physicist) notices that each oscillation takes 4.20 s and hypothesizes that the energy is quantized. (a) What is the difference in energy in joules between allowed oscillator states? J (b) What is the value of n for a state where the energy is 5.70 J? (c) Can the quantization be observed? ' Yes. n is large enough. No. Energy difference is too small and n is too large. ' Yes. Energy difference is large enough. No. Energy difference is too large and n is too small. 3. [-/1 Points] DETAILS OSCOLPHYS2016 29.1.P.002. MY NOTES ASK YO The difference in energy between allowed oscillator states in HO molecules is 0.454 eV. What is the oscillation frequency (in Hz) of this molecule? Hz + Additional Materials Reading 4. [-/1 Points] DETAILS OSCOLPHYS2016 29.2.P.004. MY NOTES ASK YO What is the longest-wavelength EM radiation (in nm) that can eject a photoelectron from zirconium, given that the binding energy is 4.05 ev? nm Is this in the visible range? Yes No5. [-/1 Points] DETAILS OSCOLPHYS2016 29.2.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the binding energy in ev of electrons in beryllium, if the longest-wavelength photon that can eject electrons is 250 nm? ev Additional Materials Reading 6. [-/1 Points] DETAILS OSCOLPHYS2016 29.2.P.008. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the maximum kinetic energy in ev of electrons ejected from a certain metal by 400 nm EM radiation, given the binding energy is 2.24 ev? ev Additional Materials Reading 7. [-/1 Points] DETAILS OSCOLPHYS2016 29.3.P.020. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the energy in joules and ev of a photon in a radio wave from an AM station that has a 1260 kHz broadcast frequency? ev8. [-/1 Points] DETAILS OSCOLPHYS2016 29.3.P.022. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Calculate the frequency in hertz of a 7.56-MeV y-ray photon. Hz + Additional Materials Reading 9. [-/1 Points] DETAILS OSCOLPHYS2016 29.3.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) What is the wavelength (in m) of a 8.79 ev photon? m (b) Find its frequency in hertz. Hz (c) Identify the type of EM radiation. radio infrared visible ultraviolet O y-ray10. [-/1 Points] DETAILS OSCOLPHYS2016 29.4.P.039. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) What is the momentum (in kg.m/s) of a 0.0547 nm wavelength photon that could detect details of an atom? kg.m/s (b) What is its energy in MeV? MeV Additional Materials Reading 11. [-/1 Points] DETAILS OSCOLPHYS2016 29.4.P.043. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) Calculate the momentum (in kg . m/s) of a photon having a wavelength of 22.4 nm. kg . m/s (b) Find the velocity (in m/s) of an electron having the same momentum. m/s (c) What is the kinetic energy (in ]) of the electron? How does it compare with the energy of the photon? Ephoton = KE electron12. [-/1 Points] DETAILS OSCOLPHYSZO16 29.6.P.049. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER At what velocity (in m/s) will an electron have a wavelength of 2.10 rn? m/s Additional Materials E1 Reading 13. [-/1 Points] DETAILS OSCOLPHYSZO16 29.6.P.050. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the wavelength (in m) of an electron moving at 2.65% of the speed of light? m 14. [/1 Points] DETAILS OSCOLPHYSZO16 29.6.P.058. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) Calculate the velocity (in m/s) of an electron that has a wavelength of 1.07 pm. m/s (b) Through what voltage (in V) must the electron be accelerated to have this velocity? (Assume the electron starts at rest.) V 1' Additional Materials III Reading 15. [-/1 Points] DETAILS OSCOLPHYSZO16 29.7.P.064. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Suppose the velocity of an electron in an atom is known to an accuracy of 2.2 x 103 m/s (reasonably accurate compared with orbital velocities). What is the electron's minimum uncertainty (in nm) in position? Ax= nm How does this compare with the approximate 0.1-nm size of the atom? (Let D represent the size of the atom.) Ax F = 1- Addltlonal Materials III Reading 16. [-/1 Points] DETAILS OSCOLPHYSZO16 29.7.P.066. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A relatively long lived excited state of an atom has a lifetime of 2.50 ms. what is the minimum uncertainty (in eV) in its energy? eV Additional Materials E2 Reading 17. [-/1 Points] DETAILS OSCOLPHY52016 29.8.P.072. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 23.2 eV electron has a 0.255 nm wavelength. If such electrons are passed through a double slit and have their rst maximum at an angle of 38.0, what is the slit separation d (in nm)? nm 18. [-/1 Points] OSCOLPHY52016 29.8.P.074. ASK YOUR TEACHER PRACTICE ANOTHER A certain heat lamp emits 230 W of mostly IR radiation averaging 1,660 nm in wavelength. (a) What is the average photon energy in joules? J (b) How many of these photons are required to increase the temperature of a person's shoulder by 2.0C, assuming the affected mass is 4.0 kg with a specic heat of 0.83 kcal/(kg - C). Also assume no other signicant heat transfer. (c) How long does this take (in 5), assuming all radiation emitted by the heat lamp is absorbed by the person's shoulder? S