The scientific term for the rate of the string’s vibration is its frequency. You measure frequency in hertz (Hz), a unit that just means “vibrations per second.” The standard tuning pitch, 440 Hz, is the pitch you hear when an object (like a tuning fork or guitar string) vibrates to and fro 440 times per second.
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As for the device's thickness, the Motorola Razr Fold measures 4.6mm thick when it's open and 9.9mm thick when the foldable is closed.
Стало известно о расширении круга вовлекаемых в терроризм мигрантовГлава ФСБ Бортников: Расширился круг вовлекаемых в терроризм россиян и мигрантов