Engineering

Ping-pong balls as sound absorbers for low-frequency noise

Long-term exposure to low-frequency noise can cause numerous health problems, but the solution may be found in an unexpected object, a ping-pong ball. Conventionally thought of as the hollow plastic balls that speed through ...

Electronics & Semiconductors

2D metal contacts stop transistor leakage currents in their tracks

Computers, despite all their apparent complexity, are basically just a large number of electronic switches, flicking on and off in the right order to process digital information. Semiconductor technology has made these switches ...

Engineering

Surface steers signals for next-gen networks

5G communications' superfast download speeds rely on the high frequencies that drive the transmissions. But the highest frequencies come with a tradeoff.

Electronics & Semiconductors

First electromechanical resonator to operate beyond 100 GHz

In what has the potential to significantly advance wireless communications and mechanical quantum systems, researchers at Yale have demonstrated the world's first electromechanical resonator to operate beyond 100 GHz.

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Frequency

Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example, if a newborn baby's heart beats at a frequency of 120 times a minute, its period (the interval between beats) is half a second.

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