# Science

from about 800 nm to 1 mm. What is the
frequency of radiation of wavelength 970 nm?
.

2.Microwaves, such as those used for radar and
to heat food in a microwave oven, have wavelengths
greater than about 3 mm. What
is the frequency of radiation of wavelength
4.75 mm?
.

3.Sodium vapor lamps, used for public lighting,
emit yellow light of wavelength 560 nm. How
much energy is emitted by an excited sodium
atom when it generates a photon?

4.How much energy is emitted by 45.8 mg of
sodium atoms emitting light at this wavelength?

5.How much energy is emitted by 1 mol of
sodium ions emitting light at this wavelength?

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2. 👎 0
3. 👁 303
1. 1.Infrared radiation has wavelengths ranging
from about 800 nm to 1 mm. What is the
frequency of radiation of wavelength 970 nm?

Convert nm to m and use c = f*w.
c is speed of light in m/s, solve for f(requency) and substitute for w(avelength).<?b>

2.Microwaves, such as those used for radar and
to heat food in a microwave oven, have wavelengths
greater than about 3 mm. What
is the frequency of radiation of wavelength
4.75 mm?

same procedure as #1.

3.Sodium vapor lamps, used for public lighting,
emit yellow light of wavelength 560 nm. How
much energy is emitted by an excited sodium
atom when it generates a photon?

E = hc/wavelength

4.How much energy is emitted by 45.8 mg of
sodium atoms emitting light at this wavelength?

mols Na = grams/atomic mass = ? mols.
E = hc/wavelength. That gives E in joules/1 atom. That x 6.02E23 = joules/1 mol. That x # moles from above = total E.

5.How much energy is emitted by 1 mol of
sodium ions emitting light at this wavelength?

See problem 4.

1. 👍 0
2. 👎 0
2. 3.43

1. 👍 0
2. 👎 0
posted by Jayla

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