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Why intrinsic semiconductor has negative halls coefficient?
The difference in the electron and hole mobilities is responsible for the small negative Hall coefficient of intrisic semiconductors. Refs: C.M.Hurd : Hall effect in metals and alloys R.Asokamani :solid state physics Busch& Schade; Solid state Physics
What is the basic difference between relaxation oscillator and RC oscillator?
The difference between an RC and LC is that the frequency - determining device in the RC oscillator is not a tank circuit. LC can operate with A or C biasing, while RC can only operate with A.
How is acoustics used in the design of concert halls?
Auditorium acoustics is a very specialized field at the intersection of acoustics and civil engineering.The two most important properties are Reverberation Control, and the control of Early Reflections.Wallace Clement Sabine was an US scientist acoustician who formulated much of the early foundation of acoustic measurements and of sound control in buildings.Before his time, the design of auditoria was very much a hit and miss situation. Some, such as the 'Big Music Hall' in Vienna was a very successful design, and was copied many times round the world. And much music was composed for this famous theatre. Other less successful attempts merely became warehouses.Chamber music is intended to be performed in small chambers (living rooms) of low reverberance, and the music for these will fail to be perfect in a larger space. Analogously, Cathedral music is intended to be heard in rooms with several seconds reverberation time, and indeed speech may be difficult, and has led to the style of speaking of a few words, followed by a pause to allow the echoes to decay.Sufficient. Leo Beranek is worth a look up, as is Harris, Cyril M.
Why 6 db is a good attenuation?
6 dB is not good nor bad as an attenuation, if the context and the signal that is attenuated is not specified. As a rule of thumb, addition between dBs is multiplication between linear attenuation, thus since 3dB is a division of the power by two, 6 dB means a division of the power by 4. Just to give an idea: In free space, without obstacles and reflections, the power of a normal voice attenuates 6 dB in dry air in about 230 cm (assuming 180° directional sound emission of the mouth, that is reasonable). This is the combined action of intrinsic air attenuation (the sound ordered power is converted by traversing air in disordered oscillations of molecules: i.e. heath) that is very small (about 1 dB/km) and of the increase of the area where the power is distributed, that going farer and farer from the source is a sphere of greater and greater radius so that power decrease due to this last effect as the square power of distance from source. The humidity further reduces air intrinsic attenuation, but since the dominant phenomenon is the other, we can say that practically nothing changes. If music is considered, the situation is more complex. Music frequencies are much more extended than voice frequencies and attenuation of the material depends on frequency (while attenuation due to distance does not, as it is intuitive). High frequencies attenuates in air much more than low frequencies, for example 50 kHz attenuates about 0.9 dB/m in dry air for 180° directional sound emission. Thus attenuation also imply a small distortion of music due to its dependence on frequency. However this effect is not so relevant to be problematic when hearing music in concert halls, due both to the small distance and to the logarithmic sensitivity characteristic of out ears. Moreover in concert halls there are a lot of reflections that are exploited in the design of a good concert hall to concentrate the sound on the public, thus the real attenuation is much reduced by the fact that power diverging from the source is redirected towards the hall center by reflections. A problem to avoid in such a design is to exploit reflections from objects too far from the source or the hall. In this case reflections recover energy, but are also delayed with respect to the original sound, creating a bad echo effect. Light exhibit similar behavior, but much more evident due to the huge frequency extension of visible light.
What happens in a winding house of a mine?
The winding house houses the engine that raises and lowers the mine's cage (lift).
What are the release dates for The Halls of Ivy - 1954 The Chinese Student 1-14?
The Halls of Ivy - 1954 The Chinese Student 1-14 was released on: USA: 18 January 1955
What are the release dates for The Halls of Ivy - 1954 The Honor Student 1-32?
The Halls of Ivy - 1954 The Honor Student 1-32 was released on: USA: 24 May 1955
What do you call a place where students live?
halls of residence student flat
How many schools are affected from crowded halls?
All of them... From a student in 6th grade..
What is the Student life for the University of Michigan?
Student Life often refers to campus living, and other organizations related to U of M. This could include residence halls, clubs, special campus events, etc.
When did Matt Bomer and Simon Halls meet for the first time?
Matt Bomer is an American actor who is married to publicist Simon Halls since 2011. It is not known exactly when Matt and Simon met for the first time.
How does the Marines' Hymn commemorate their part in the Mexican American War?
"From the Halls of Montezuma" is a reference to their efforts at the Battle of Chapultepec.
Where is the Halls Public Library in Halls located?
The address of the Halls Public Library is: 110 North Church Street, Halls, 38040 0236
What are the release dates for Cafe American - 1993 Deck the Halls with Boughs of Holly 1-12?
Cafe Americain - 1993 Deck the Halls with Boughs of Holly 1-12 was released on: USA: 18 December 1993
What is the new halls flavor?
Halls Lime
What is Halls process?
The Hall-Héroult process is the major industrial process for the production of aluminum. It involves dissolving alumina in molten cryolite, and electrolysing the molten salt bath to obtain pure aluminum metal. This process requires a lot of electric energy.
Where is the American flag found?
Commonly, schools, fire departments, police departments, post offices, and city halls, etc.
