The energy in eV of a photon, if the requency of the radiation is 7 × 10¹4 Hz is 4.0 eV 2.9 eV 3.9 eV 1.9 eV a) c) (b) (d)
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- Suppose the visible light of wavelength i= 500 hm position of an is used to determine the electron to within the wavelength of light. What is the minimum uncertainty in the electron's speed? а. Av =1.158 ms-1 b. Av = 11.58 ms-1 C. Δν-1158 ms-1 O d. Av =115.8 ms10 1.51 3.40 Energy (CV) 13.6 3.4 eV 13.6 eV 1.9 eV 10.2 eV 1.5 eV = 3 # = 2 = 1 *1 = 00 The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is 4 Q Search O- hp EST INV H1. A light beam of wavelength 679 nm and intensity 156 W/m^2 shines on a target of area 2.91 m^2 for a duration of 3.64 s. How many photons from the light beam will have struck the target during this time? 3.96E+21 7.91E+21 9.04E+21 5.65E+21
- An electron sitting in the -4eV energy level of this atom is struck with a photon and as a result it rises to the -1.8eV energy level. What is the wavelength of this photon? -0.2 ev -0.4 ev -1.8 ev -4 ev 180nm 301nm 797nm 564nmGiven that the energy of an electron in the He+ ion is Z²RH n² En = - } what is the energy of a photon that can excite an electron from the ground state to the first excited state? a. 4/3 RH b. RH c. 5 RH d. 4 RH e. 3 RHMY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A solid metal sphere emits 1.62 x 1020 photons every second with a radiating power of 1.93 W. (a) Determine the energy associated with each photon. eV (b) Assuming the sphere's power output is associated with the peak wavelength, determine the temperature of the sphere at which this wavelength is emitted. K Additional Materials O Reading
- -27 (a) What is the wavelength (in nm) of a photon that has a momentum of 4.50 x 10 kg · m/s? nm (b) Find its energy in eV. eVAn electromagnetic beam with wavelength do is incident upon an unknown metal. If electrons are ejected with maximum kinetic energy K, what is the work function of the metal? No a) hc/λo b) hλo/c c) hc/20-K d) hλo/c-K51) A photon of energy 1.24 eV is absorbed by a molecule. a) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? A..........cm B..........cm-1 The molecule transitions to an energy level of 0.24 eV, and emits a photon. b) What is the energy of the emitted photon (eV)? ..........eV c) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? C..........cm D..........cm-1 d) Find D-B in cm-1. ..........cm-1 The second photon of energy 1.14 eV is absorbed by the same molecule. e) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? E..........cm F..........cm-1 The molecule transitions to an energy level of 0.24 eV, and emits a photon. f) What is the energy of the emitted photon (eV)? ..........eV g) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? G..........cm…
- 7) Find the wavelength of the photon as an electron makes a transition from n=4 to n=3. for particle in a box with E1=13.6 eV2. Assume now that an electron is not a point but a sphere of radius R over whose surface the electron charge is uniformly distributed. a) Find the total enery associated with the electric field built up by the "electron sphere". b) If you equate the total electric energy you get in a) with the rest mass energy of electron Eo mc², Calculate the value of R. = R is often called the classical radius of the electron.19 A 982 W bulb produces monochromatic U-V light of frequency 3.71x1 Hz. The light falls on 15 a clean metal whose cut-off frequency is 5.49x1014 Hz. Find the maximum speed of the emitted electrons, in m/s.