Question

26. A sodium vapor lamp has a power output of 300 W. If 390 nm is the average wavelength of the source, about how many photons are emitted per secood? (h 1 nm- 10* m) 6.63 x 10Js, c 3.00x 10* m/s, and a. 10 b, 1021 e, 10s d. 10 27. The "seeing" ability or resolution of radiation is determined by its wavelength. If the size of an atom is approximately 10* m, how fast must an electron travel to have a wavelength smaller than that of an atom? (m,-911x10-31 kg andh-663x10-м J4) a 7.3 × 106 m/s b. 3.4 x 10m/'s c. 1.0 x 10 m's d. 5.4 x 10s m/'s 28. The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of the n-5 state? a. 2.72 eV b. -2.72 eV c. 0.544 eVv d.-0.544 ev 29. A hydrogen atom in the ground state absorbs a 12.75 eV photon. To what level is the electron promoted? (The ionization energy of hydrogen is 13.6 eV) a. m-2 b.n-3 C-4 d, n = 5 30. Which of the following transitions in hydrogen from an initial state (n) to a final state (n) results in the most energy emitted? a. n-80, n 2 b, n, = 3, nr = 95

Answer 1

Using the concept of energy of a photon of light is given by
E = hf where h is Planck's constant and f is the frequency of the light.

m