frequency's unit is Hz which mean cycles per second
given frequency * wavelength = speed of wave
speed of light = 3x10^8 m/s
wavelength = 680nm = 680x10^-9 m
frequency * 680x10^-9 m = 3x10^8 m/s
frequency = 3x10^8 / 680x10^-9
= 4.41x10^14 Hz
= 441x10^12 Hz
= 441 THz
which is the frequency for red light
The correct answer is "high blood pressure."
Further Explanation:
There are numerous biofeedback therapies that are useful for many illnesses. The sessions for a biofeedback therapy can last anywhere from 30 minutes up to 60 minutes and may take several visits to finish the therapy.
When the biofeedback therapy is being performed there may be relaxation therapy used also. Some of the relaxation therapy included are;
- deep breathing
- muscle relaxation
- meditation
A few of the techniques used in biofeedback therapy are;
- EEG
- EMG
- Temperature biofeedback
- Galvanic skin response training
Learn more about biofeedback at brainly.com/question/1100543
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