1.) Sodium is a common element (in table salt!) and was one of the first to have

Question

1.) Sodium is a common element (in table salt!) and was one of the first to have its spectrum identified when salt was sprinkled into a flame. A closer inspection revealed that the characteristic yellow color was two spectral lines close to one another. The same two lines are seen in the Sun, where sodium absorbs continuous blackbody radiation from within the star. Why are there two lines?

a.) the atoms are at two different temperatures

b.) the two lines are in different series

c.) There are two isotopes of sodium, and their different masses alter the wavelengths emitted

d.) The elctron has spin, and in hte atom that gives rise to two energy levels

2. The Wien Law is a result of the theory of blackbody radiation, describing the continuous distribution of wavelengths emitted by hot objects. The most energy per time is emitted at a wavelength given by this law. At longer or shorter wavelengths the object emits less light. Where is the maximum in the energy emitted by Earth's surface, which has a temperature on average of about 14 Celsius or 287 Kelvin?

PICK THOSE THAT APPLY.

a.) about 10 microns (10-6m)

b.) about 1 mm

c.) about 10,000 nm

d.) about 0.001 cm

Explanation / Answer

1). d is correct. This is zeeman effect: Sodium has 2 wavelength closely seperated related to spin of electron as 1/2 or -1/2 .

2) Weins displacement law : Wavelengthmax×Temperature =0.002898mK.

So, 0.002898/287 = 1.009×10-5m.

Or 0.00001009m

Or 0.001009cm

Hence d is correct

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