How do flutes produce sound? A flute produces sound when a stream of air directed across a hole in the instrument creates a vibration of air at the hole. The airstream creates a Bernoulli or siphon. This excites the air contained in the usually cylindrical resonant cavity within the flute. Do flutes sound high or […]
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What can the shape of an age structure diagram tell us about the future of a population?
What can the shape of an age structure diagram tell us about the future of a population? By using an age structure diagram it can be predicted whether a population will increase, decrease or maintain stability. Predictions can also be made as to why this trend is showing for example: is the population decreasing because […]
What is espionage risk?
What is espionage risk? Put simply, e-Espionage is unauthorised and usually criminal access to confidential systems and information for the purposes of gaining a commercial or political advantage. Today, the risk of espionage is current and concrete for all organisations worldwide, across both the private and public sectors. What is the phenomenon of espionage? Espionage, […]
What wand did Bellatrix use?
What wand did Bellatrix use? Bellatrix Lestrange’s wand was 12¾” long, made of Walnut, and had a dragon heartstring core. The wand was constructed by Garrick Ollivander, who described it as “unyielding”. What was Bellatrix second wand? Bellatrix Lestrange’s second wand was possibly bought in 1998, but it is more likely Bellatrix stole it or […]