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kramer
3 years ago
11

If a test measures what it is designed to measure, then it has this.

Geography
2 answers:
Gennadij [26K]3 years ago
7 0
D. I believe is the answer !!!
jek_recluse [69]3 years ago
4 0
Validity
(Sociology quiz if i’m guessing? this should be correct)
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Tectonic plates definition
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Tectonic plates are parts (pieces) of the outermost layer of Earth: the Crust. (the outermost part of the mantle is also often included in the plates). This means that the land in the middle of the plates is relatively stable while the borders of the plates can be in movement - after all this is where two pieces meet. Plate borders are where the vocanoes and Earthquakes often take place.
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3 years ago
Using Wien’s Law, estimate the wavelength at which these common materials radiate their peak brightness (show your work):
SSSSS [86.1K]

Explanation:

Wien’s Law:

\lambda _{max}\propto \frac{1}{temperature}

The law states that the wavelength at which black body emits maximum heat  is inversely proportional to the temperature of the body in Kelvins.

\lambda _{max}=\frac{2.9\times 10^{-3}}{T}

1) Walls at 300 K

\lambda _{max}=\frac{2.9\times 10^{-3} mK}{300 K}

\lambda _{max}=9.666\times 10^{-6} m

2) Ice water at 273 K :

\lambda _{max}=\frac{2.9\times 10^{-3} mK}{273 K}

\lambda _{max}=1.062\times 10^{-5} m

3) Hot water at 373 K :

\lambda _{max}=\frac{2.9\times 10^{-3} mK}{373 K}

\lambda _{max}=7.775\times 10^{-6} m

4)Skin at 310 K:

\lambda _{max}=\frac{2.9\times 10^{-3} mK}{310 K}

\lambda _{max}=9.355\times 10^{-6} m

5)An incandescent light bulb at 3000 K

\lambda _{max}=\frac{2.9\times 10^{-3} mK}{3000 K}

\lambda _{max}=9.666\times 10^{-7} m

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3 years ago
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Answer:

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Which of the following completes the proof? (6 points)
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