basic repetition rate
1Difference and Repetition —   …
2Oscilloscope — This article is about current oscilloscopes, providing general information. For history of oscilloscopes, see Oscilloscope history. For detailed information about various types of oscilloscopes, see Oscilloscope types. Illustration showing the… …
3History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …
4Auditory brainstem response — The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I …
5Pitch (music) — In musical notation, the different vertical positions of notes indicate different pitches. Pitch is an auditory perceptual property that allows the ordering of sounds on a frequency related scale.[1] Pitches are compared as higher and lower in… …
6Education in Iraq — is administered by the Ministry of Education. UNESCO reports that prior to the first Gulf War in 1991 Iraq had one of the best educational performances in the region. Primary school Gross Enrollment Rate was 100% and literacy levels were high.… …
7Radar signal characteristics — A Radar System uses a Radio Frequency electromagnetic signal reflected from a target to determine information about that target. In any radar system, the signal transmitted and received will exhibit many of the characteristics described below.The …
8sound reception — Introduction response of an organism s aural mechanism, the ear, to a specific form of energy change, or sound waves. Sound waves can be transmitted through gases, liquids, or solids, but the hearing function of each species is particularly …
9Bat species identification — TOCrightBat detectors are the most common way to identify the species of flying bats. There are distinct types of call which can indicate the genus, and variations in pattern and frequency which indicate the species. For readers not familiar with …
10Laser — For other uses, see Laser (disambiguation). United States Air Force laser experiment …
