Answer:
C. Destructive interference
Explanation:
<em>Destructive interference</em> is when there are two waves <u>with the same frequency</u>, and the peaks of one wave (the highest points) line up with the valleys (the lowest points) of the second one.
Constructive interference would cause the sound to be louder.
Absorption and reflection are interactions that would not take into account the fact that the headphones produce sounds.
Answer:
Pollinate, If i gave you the wrong answer, i'll improve my answer for you
Explanation:
Answer: The correct answer is -297 kJ.
Explanation:
To solve this problem, we want to modify each of the equations given to get the equation at the bottom of the photo. To do this, we realize that we need SO2 on the right side of the equation (as a product). This lets us know that we must reverse the first equation. This gives us:
2SO3 —> O2 + 2SO2 (196 kJ)
Remember that we take the opposite of the enthalpy change (reverse the sign) when we reverse the equation.
Now, both equations have double the coefficients that we would like (for example, there is 2S in the second equation when we need only S). This means we should multiply each equation (and their enthalpy changes) by 1/2. This gives us:
SO3 —>1/2O2 + SO2 (98 kJ)
S + 3/2O2 —> SO3 (-395 kJ)
Now, we add the two equations together. Notice that the SO3 in the reactants in the first equation and the SO3 in the products of the second equation cancel. Also note that O2 is present on both sides of the equation, so we must subtract 3/2 - 1/2, giving us a net 1O2 on the left side of the equation.
S + O2 —> SO2
Now, we must add the enthalpies together to get our final answer.
-395 kJ + 98 kJ = -297 kJ
Hope this helps!
I am pretty sure the more alkaline a solution is the basic it is. Using that definition you can, you can compare the pH values for each of the solutions and the ones that have the highest pH values will be the most alkaline (basic) and the ones with the lowest pH values will be the least alkaline (acidic). pH=[H₃O⁺] and pH=14-pOH (use pOH=[OH⁻<span>])
</span>pH=14-0.5=13.5
pH=3.5
pH=14-(-log(5.62x10^-5))=9.75
pH=-log(3.16x10^-7)=6.5
pH=0.5
ordered from most alkaline to least:
pOH=0.5, [OH]=5.62x10^-5, <span>[H₃O⁺]=3.16x10^-7, pH=3.5, pH=0.5
Hope this helps. Let me know if you have any further questions in the comments.</span>
Answer:
The answer in °C is 3498.85°C
Explanation:
The Celsius scale is considered a derived scale, defined in relation to the Kelvin scale.
The zero on the Celsius scale is defined as 273.15 K. This means that 100°C is defined as the equivalent of 373.15 K.
The Celsius scale is of intervals but not of proportions, which means that it pursues a relative scale and not an absolute scale.
To calculate the temperature in °C at which the tin becomes superconducting we will use the following formula:
°C = Temperature in K - 273.15 = 3772 - 273.15 = 3498.85°C