Removing an electron from the metal requires 3.5 eV. The conversion between eV and J is: 1 eV = 1.6 x 10-19 J a) How many Joules is that? b) What is the velocity of the electron upon emission if the electron's mass is m=9.1*10-31 kg?
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- Determine the distance between the electron and proton in an atom if the potential energy UU of the electron is 11 eV (electronvolt, 1 eV =1.6×10−19=1.6×10−19 J). Give your answer in Angstrom (1 A = 10-10 m).Which of these expressions would yield the wavelength of light in meters emitted when an electron drops from orbit n = 3 to n = 2 in a Bohr hydrogen atom? Given h = 4.14 x 10-15 eVs and c = 3.00 x 108 m/s. a. 1.89/hxc b. hc/1.89 c. 1.89 x h x c d. (1.51 + 3.4)/hc e. hc/3.4Determine the distance between the electron and proton in an atom if the potential energy ?U of the electron is 16 eV (electronvolt, 1 eV =1.6×10−19=1.6×10−19 J). Give your answer in Angstrom (1 A = 10-10 m).
- If the intensity of a light source is increased while the frequency and the metal surface remain the same, which of the following will occur? a. Electrons will be emitted at an increased rate with more average energy per electron. b. Electrons will be emitted at the same rate with the same average energy per electron. c. Electrons will be emitted at the same rate but with less average energy per electron. d. Electrons will be emitted at the same rate but with more average energy per electron. e. Electrons will be emitted at an increased rate with the same average energy per electron.Which should I choose and whyCan you help with this please?
- 2 D -e Physical constants (A) (in m) Bohr Model mv² - h = 6.626 x 10-34 Js; Ke² = 2.307 x 10-28 Jm; m = 9.11 x 10-31 kg. The old Bohr model of the hydrogen atom was based on... (1) the assumption that the electron travels on a circle (A) What is the radius of the orbit with n = 5? (B) What is the speed of the orbit with n = 5? Ke² ra and obeys Newton's second law, and (2) the hypothsis that angular momentum is quantized. For the Bohr model, (1) mvr = n (2) 27 OA: 2.774x10-10 OB: 3.468x10-10 OC: 4.334x10-10 OD: 5.418x10-10 DE: 6.773x10-10 OF: 8.466x10-10 OG: 1.058x109 OH: 1.323x10-9 Submit Answer Tries 0/20In a Millikan experiment, two horizontal parallel plates are 3.5 cm apart. A sphere A whose mass is equal to 4.2 x 10^-17 kg remains in suspension, while the potential difference between the plates is 5.00 V and the upper plate is positive.a. Determine the charge on the sphere.b. What is the magnitude of the sphere's excess or deficiency of electrons?A 83.0 kg athlete running a "4-minute mile" (i.e. 4.00 min/mile) _____ nm an electron (me = 9.10939 1028 g) moving at 3.90 106 m/s in an electron microscope _____ nm.