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vovangra [49]
4 years ago
5

Question 2 (2 points) Question 2 Unsaved Why does a blue shirt look blue? Choose the BEST explanation. Question 2 options: All w

avelengths of light are absorbed by the shirt. The shirt absorbs the blue wavelengths. The shirt reflects all wavelengths of light. The shirt reflects the blue wavelengths. Question 3 (2 points) Question 3 Unsaved Why is charcoal black? Question 3 options: Charcoal absorbs all wavelengths of light that fall on it. Charcoal reflects black-colored light. Charcoal reflects all wavelengths of light that fall on it. Charcoal has a black-colored pigment. Question 4 (2 points) Question 4 Unsaved Which color has the longest wavelength? Question 4 options: Blue Red Purple Yellow Question 5 (2 points) Question 5 Unsaved Which color has the highest frequency? Question 5 options: Yellow Purple Blue Red Question 6 (2 points) Question 6 Unsaved If white light shines on an object and the red, orange, green, blue, indigo, and violet light is absorbed. What color does your eye see? (hint: see what color is missing) Question 6 options: White Red Purple Yellow Question 7 (2 points) Question 7 Unsaved Which statement is TRUE about white light? Question 7 options: It makes all objects appear white. It can be seen when all colors are absorbed. It contains all of the waves of the electromagnetic spectrum. It contains all of the wavelengths of the visible light spectrum.
Chemistry
1 answer:
Mazyrski [523]4 years ago
5 0
1 . Each color has a different wavelength allowing the eye to see it.2 . The shirt reflects the blue wavelengths.
3 . Charcoal absorbs all wavelengths of light that fall on it4 . Red
5 . Purple 6 . Yellow7 . It contains all of the wavelengths of the visible light spectrum.
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What is the half-life of an isotope that decays to 12.5% of its original activity in 19.8 hours?
katen-ka-za [31]
x= x_{0}  e^{kt} ,where~ x ~is~ the ~ |amount\ of \material\ at\ any~~time~t

and~ x_{0} ~the~original~amount.
when~x=  \frac{12.5}{100} x_{0}  }= \frac{125}{1000}  x_{0}
\frac{x}{ x_{0} } = \frac{125}{1000}= \frac{1}{8}
when t=19.8 hrs,
x= x_{0}  e^{19.8 k}, 
 \frac{x}{ x_{0} } = e^{19.8 k}, 
 \frac{1}{8} = e^{19.8k} ,
ln \frac{1}{8} =19.8 k,

ln1-ln8=19.8k,
0-ln 2^{3} =19.8 k,
-3 ln2=19.8k
k= \frac{-3 ln2}{19.8} = \frac{- ln 2}{6.6}x= x_{0}  e^{ \frac{-ln2}{6.6}t } ,
 \frac{x}{ x_{0} } = e^{ \frac{- ln 2}{6.6}t } 
\frac{1}{2} = e^{ \frac{- ln2}{6.6}t } = \frac{1}{ e^{ \frac{ln 2}{6.6} t} } ,
2= e^{ \frac{ln2}{6.6}t } ,
ln2=ln  e^{ \frac{ln 2}{6.6}t } = \frac{ln 2}{6.6} t~ln e= \frac{ln2}{6.6} t,
8 0
4 years ago
Causes warm air to rise in the atmosphere. is what type of heat transfer?
shepuryov [24]

Answer:

osmosis is the answer

Explanation:

cause air rises from lower concentration to lower concentration

3 0
4 years ago
Calculate the pH after 0.018 mole of HCl is added to 1.00 L of each of the four solutions. (Assume that all solutions are at 25°
Over [174]

Explanation:

Below are attachments containing the solution

7 0
3 years ago
During inhalation, View Available Hint(s) During inhalation, oxygen molecules move into the lungs, and carbon dioxide molecules
bekas [8.4K]

Answer:

the diaphragm and rib muscles contract

Explanation:

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4 years ago
What would the coefficient of al(no3)3 be in the balanced equation?
soldi70 [24.7K]
First, you have to know what reacts with Aluminum Nitrate so that you can balance the equation and find out the stoichiometric coefficient. I found a similar question from another website as shown in the picture attached. Balancing the reaction would result to:

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<em>The coefficient is 2.</em>

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4 years ago
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