question: if an e-mail is detected to be spam, it will be automatically filtered from the user's inbox to a designated spamfighter folder.
Capitalize this past sentence correctly.
A: If an e-mail is detected to be spam, it will be automatically filtered from the user's inbox to a designated SPAMfighter folder.

question: visible light ranges from about 390 to 790 nm, frequence (from 3.91014 hz to 7.91014) hz. under some conditions there also possible take place total reflection.
Capitalize this past sentence correctly.
A: Visible light ranges from about 390 to 790 nm, frequence (from 3.91014 Hz to 7.91014) Hz. Under some conditions there also possible take place total reflection.

question: electromagnetic fields have different frequencies - expressed in hertz (hz), or oscillations per second - suited to different uses, for example:
Capitalize this past sentence correctly.
A: Electromagnetic fields have different frequencies - expressed in Hertz (Hz), or oscillations per second - suited to different uses, for example: