pH scale is used to measure the acidity or alkalinity on a scale of 0-14 where 0-6.9 is the acidic region , 7.1-14 is the basic region and 7 is for the neutral substance. We can calculate the concentration of proton from pH.
where is the concentration of proton
As per the question ,the pH of coffee is 5.6 and we need to find the concentration of proton so putting the values in the above equation, we get
Answer: There will be 41382 J energy must be absorbed by 45.0g of water to increase its temperature from to
.
Explanation:
Given: Mass = 45.0 g
Initial temperature =
Final temperature =
Formula used to calculate heat energy is as follows.
where,
q = heat energy
m = mass of substance
C = specific heat = (here, for water)
= initial temperature
= final temperature
Substitute the values into above formula as follows.
Thus, we can conclude that there will be 41382 J energy must be absorbed by 45.0g of water to increase its temperature from to
.
Answer:- Frequency is .
Solution:- frequency and wavelength are inversely proportional to each other and the equation used is:
where, is frequency, c is speed of light and
is the wavelength.
Speed of light is .
We need to convert the wavelength from nm to m.
( )
=
Now, let's plug in the values in the equation to calculate the frequency:
= or
since,
So, the frequency of the green light photon is .