Science

1.Infrared radiation has wavelengths ranging
from about 800 nm to 1 mm. What is the
frequency of radiation of wavelength 970 nm?
Answer in units of s−1
.

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?
Answer in units of s−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?
Answer in units of J.

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

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

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asked by Emma
  1. 1.Infrared radiation has wavelengths ranging
    from about 800 nm to 1 mm. What is the
    frequency of radiation of wavelength 970 nm?
    Answer in units of s−1

    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?
    Answer in units of s−1

    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?
    Answer in units of J.

    E = hc/wavelength

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

    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?
    Answer in units of kJ.

    See problem 4.

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    posted by Jayla

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