1. Sodium salts give off a characteristic yellow orange light when added to the
ID: 898682 • Letter: 1
Question
1. Sodium salts give off a characteristic yellow orange light when added to the flame of a
Bunsen burner. This yellow orange color is due to two narrow bands of radiation with
wavelengths of 588.9953 and 589.5923 nm. Calculate the frequencies of these emission lines.
2. Which carries more energy, yellow light with a wavelength of 580 nm or green light with a
wavelength of 660 nm?
3. Give the color of each of the following ions and then match them
with the given wavelengths.
a. Ba2+
b. Li+
c.Sr2+
= 661,
= 551 nm,
= 671 nm
4. The energy for n = 1 for the hydrogen atom was found to be -2.179 x 10^-18 J/atom, give this
energy values in terms of kJ/mole.
5. Calculate the energy of light emitted when a electron changes from n = 3 to n = 1 in the
hydrogen atom. In what region of the spectrum is this radiation found?
6.Which of the following electron transitions correspond to absorption of energy and which to emission.
a. n = 2 to n = 4
b. n = 5 to n=2
c. n = 4 to n = 8
7. Enormous numbers of microwave photons are needed to warm macroscopic samples of matter.
A portion of soup is heated in a microwave oven with radiation having a wavelength of 1.55 x 10^-2 m.
The soup requires 82 kJ of energy to be heated from 20 degrees C to 98 degrees C. How many
photons are absorbed by the water in the soup?
Explanation / Answer
There are multiple questions here . i am allowed to answer only 1 at a time. I will answer 1st question for you.Please ask other as different question.
f = c/wavelength
for wavelength = 588.9953 nm
f = c/wavelength
= (3*10^8)/ (588.9953*10^-9)
=5.09342*10^14 Hz
for wavelength =589.5923 nm
f = c/wavelength
= (3*10^8)/ (589.5923*10^-9)
=5.088262*10^14 Hz
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