What is the frequency and energy of photons emitted by excited mercury atoms with a wavelength of 6900 angstones? (1 angstone= 1 times 10^-8cm)
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frequency * wavelngth = c "speed of light"
freq = c / (6900 * 10^ -8 cm) =(3 * 10^ 11 cm/sec) / ( 6.9 * 10 ^ -5 cm) = (1/2.3 )* (10^16) /sec
= 4.348 * 10^15 Hz
E = h*freq = Planc's constant * 4.348 * 10^15 Hz = 4.135 * 10^ -15 eV sec * 4.348 * 10^15 Hz = 17.98 eV
freq = c / (6900 * 10^ -8 cm) =(3 * 10^ 11 cm/sec) / ( 6.9 * 10 ^ -5 cm) = (1/2.3 )* (10^16) /sec
= 4.348 * 10^15 Hz
E = h*freq = Planc's constant * 4.348 * 10^15 Hz = 4.135 * 10^ -15 eV sec * 4.348 * 10^15 Hz = 17.98 eV