Why can't we use solar type stars as spiral tracers? what typeof stars make good spiral tracers? why? What characteristics dothey have to perform this function?

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Electromagnetic radiation is emitted when a charged particle movesthrough a medium faster than the local speed of light. Thisradiation is known as Cerenkov radiation. Cerenkov radiation isfound in many interesting places such as particle detectors andnuclear reactors and can even be seen by astronauts when cosmicrays traverse their eyes. It should be stressed that the particleis never going faster than the speed of light in vacuum (or c),just faster than the speed of light in the material (which isalways less than c). The creation of Cerenkov radiation occurs inmuch the same way that a sonic boom is created when a plane ismoving faster than the speed of sound in the air. The variouswavefronts that propagate in the material add coherently to createan effective shock wave. In this problem, you will become familiarwith this type of radiation and learn how to use its properties toget information about the particles that created it.
A)What is the threshold velocity v_threshold (water) (i.e., theminimum velocity) for creating Cerenkov light from a chargedparticle as it travels through water (which has an index ofrefraction of n=1.33)?
v_threshold (water) =c
B)What is the threshold velocity v_threshold (ethanol) for creatingCerenkov light from a charged particle as it travels throughethanol (which has an index of refraction of n=1.36)?
v_threshold (ethanol) =c
C)Which of the following best explains why neutrally chargedparticles can't give off Cerenkov radiation?

a)Neutral particles are too heavy to emit radiation.
b)Neutral particles don't interact with the electromagnetic fieldsof the medium.
c)Neutral particles can't move above the threshold velocity forCerenkov radiation.
d)Charged particles hit the nuclei of the material more often andthus create more radiation

If you experienced these lab questions, please help me out answerthem. appreciate your help.

1/Plot T vs. meff on log-log paper. Why should the slope of log Tvs. log meff equal 0.5? Consider how you derived meff. Why does theslope have to equal 0.5?

2/If you plotted the excess mass as a function of the mass you hungon the end of the spring what should the graph look liketheoretically? what should the slope be?

3/your timing error can be as much as 0.2s. Why was it better totime twenty cycles and find the average time rather than to findthe time for one cycle twnty times and average the results?

4/If you displace the end of the spring a little or alot, in otherwords if you change the amplitude of the oscillation, the periodwill be exactly the same. How can this happen? What is differentabout the motion of the spring? How does this relate to theequations you use in this experiment?

You know that certain musical notes sound good together -harmonious - whereas others do not. This harmony is related to the various harmonics of the notes played. The musical notes C (262 Hz) and G (392 Hz) make a pleasant sound when played together; we call this consonance. As the Figure shows, the harmonics of the two notes are either far from each other or very close to each other (within a few Hz). This is the key to consonance: harmonics that are spaced either far apart of very close. The close harmonics have a beat frequency of a few Hz that is perceived as pleasant. If the harmonics of two notes are close, but not too close, the rather high beat frequency between the two is quite unpleasant. This is what we hear as dissonance. Exactly how much a difference is maximally dissonant is a matter of opinion, but harmonic separations of 30 - 40 Hz seem to be quite unpleasant for most people.

What is the beat frequency between the second harmonic of G and the third harmonic of C?

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Why can't we use solar type stars as spiral tracers? what typeof stars make good spiral tracers? why? What characteristics dothey have to perform this function?

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