<span>Pepsin is an enzyme that breaks down proteins into amino acids in the stomach (where the pH is 1-3). Pepsin needs to be in an acidic environment to be activated. The optimum temperature is between 30 oC and 40 oC because the average human body temperature is 37 oC. The optimum pH is the acidic one because your stomach has an acidic pH.</span>
Frequency describes the number of waves that pass a fixed place in a given amount of time. So if the time it takes for a wave to pass is is 1/2 second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.
The blue visible light waves have a shorter wavelength than the red visible light waves. Since both the waves travel at the speed of light, which is a constant for a particular medium, their frequencies will be inversely related to their wavelength. This is given by the formula: speed = wavelength x frequency. Thus blue visible light will have a higher frequency than the red visible light.
If she's learning about like how she was made its best to look at books with the right information.
If its like to help her figure out who she is as a person then she should maybe take a day to go out to a quiet place like a nature trail and think about it.