Select the physical properties. Select all that apply.
2 answers:
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It is a radio wave
Explanation:
The energy of an electromagnetic waves is related to its frequency by the equation:
where
h is the Planck constant
f is the frequency of the wave
We notice that the energy of an electromagnetic wave is proportional to its frequency. This means that waves with higher frequencies, such as gamma rays, x-rays, are more energetic, while waves with lower frequencies, such as microwave and radio waves, are the less energetic.
In this case, we want to find the frequency of a wave with energy
E = 0.000001 eV
Converting into Joules,
Solving for the frequency,
Which falls in the range of frequency of radio waves.
Learn more about electromagnetic waves:
#LearnwithBrainly
Solution :
The buffer is the one that contains weak acid (the is nearly equal to the required pH) and the salt of its conjugate base.
The values of the given weak acids are as follows :
HCOOH : = 3.744
HCN : = 9.21
Since the required pH is 5.03, the suitable buffer is the mixture of the acetic acid and the salt of its conjugate base.
Let suppose the volumes of and
are x and y mL respectively.
So the total volume of the buffer is 1000 mL.
∴ x+ y = 1000 ................(1)
Writing the Henderson-Hasselbalch equation for the given buffer solution :
.............(2)
y = 1.9 x
Substituting the values of y in equation (1), we get
x + 1.9 x = 1000
x = 345
Putting the value of x in (1), we get
345 + y = 1000
y = 655
Therefore the volume of is 345 mL and the volume of
is 655 mL.