advertisement

Chemistry Wave Review Name:______________________________________Per____ E = hv c = 3.00 x 108 m/s = wavelength (m) c=λv 1 m = 1 x 109 nm 1Mega (M) = 1 x 106 Plank’s constant (h) = 6.626 x 10-34 kg •m2/ sec Using the equation above solve the following equations: 1. How are energy, frequency and wavelength related? 2. A radio station broadcasts at a frequency of 105.4 MHz. What is the wavelength of this electronmagnetic wave? 3. A line in the bright-line spectrum of sodium has a wavelength of 590 nm. What is the frequency of this line? 4. The laser in an audio compact disc player uses light with a wavelength of 7.80 x 10 2 nm. A. What is the frequency of this light? B. What is the energy of a photon of this light? C. If this is the amount of Joules per photon, how many photons would be in 0.35 Joules of this laser? 6. It takes 7.21 x 10-19 J of energy to remove an electron from an iron atom. What is the maximum wavelength of light that can do this? 7. The work function for an element is the energy required to remove an electron from the surface of the solid. The work function for lithium is 279.7 kJ/mole of electrons. One mole of electrons is equal to 6.022 x 1023 electrons. What is the max. wavelength of light that can remove an electron from an atom of lithium metal? (hint: first convert kj/mole to J/e-)