It's impractical to count the number of sound or light waves passing a point every second, but you can calculate frequency(measured in Hertz, or cycles per second) if you know two other parameters: the length of the waves and their speed of transmission. Calculating wave speed, frequency an...
However, a camera's lens focuses light, while the lenses used in holography cause the beam to spread out. A beam splitter: This is a device that uses mirrors and prisms to split one beam of light into two beams. Mirrors: These direct the beams of light to the correct locations. Along...
Decibel (dB) is the unit used to measure the intensity of a sound. A 3,000-hertz tone of 0 dB is the softest sound that a normal human ear can hear. Frequency of a sound is the number of sound waves that pass a given point each second. Hertz is the unit used to measure frequen...
Hertz, the unit of frequency as defined by the International System of Units, or "SI," represents the number of times per second a signal oscillates. If a given wave is moving, such as light, the path can be thought of as a point traversing a sine wave. The absolute difference between...
Hertz (Hz): frequency in cycles per secondHi-Z: short for high impedance. Z is a popular abbreviation for impedance; Hi is simply a shortened version of high; usually refers to a 1/4" line input with high impedance, typically several thousand ohms or more, and often provided as an ...
From the power grid, a computer expects to get (in the United States) 120-volt AC power oscillating at 60 Hertz (see How Power Distribution Grids Work for more information). A computer can tolerate slight differences from this specification, but a significant deviation can cause the computer'...
Plan ahead.It's been said but bears repeating: Make sure you know where you're going to put your monitor. If you have a spot picked out, check the monitor's dimensions and then measure the space where you plan to put it. If you intend to get a new entertainment center or desk to...
Radio waves travel at the speed of light,roughly 1,000 feet per microsecond; so if the radar set has a good high-speed clock, it can get an accurate distance measurement of the airplane. Using special signal processing equipment, the radar set can also measure the Doppler effect very accur...
The first photon can stimulate or induce atomic emission such that the subsequent emitted photon (from the second atom) vibrates with the same frequency and direction as the incoming photon. Mirrors The other key to a laser is a pair of mirrors, one at each end of the lasing medium. ...
Hertz in 1887. Einstein explained it in terms of quantum theory in 1905, and since then, physicists have accepted that, while light may behave as a particle, it is a particle with a characteristic wavelength and frequency, and these quantities are related to the energy of the light or ...