cherenkovradiation-閱讀頁
2025-07-30 22:48本頁面
【正文】 The unperturbed fields so Suppose that the scattering region is a uniform dielectric sphere of radius a, is constant inside a sphere and vanishes outside ??*2*0 300s in c o s()SCA q a q a q akDq? ?? ????? ???????At low frequencies or in the forward direction Perform the integral 24 6 * 2000l im ( )3q B o r nd kad? ? ? ?????? ???????Blue sky The effective variation in dielectric constant is where is molecular polarizability (p161) If individual molecules are assumed to possess dipole moments 0 ()j m o l jp E x???mol?242 *202 ()16jiq xm oljdk ed? ? ? ????? ?0 ()m o l jjxx? ? ? ? ????The differential cross section is The total cross section For dilute gases 1r m o lN???4422222| 1 | | 1 |63 rkk nNN???? ??4222 | 1 |3kNnN?? ???0() xI x I e ???In traversing a thickness dx of the gases, the fractional loss of flux is so the beam intensity is N dx? with absorption or attenuation coefficient Discussion (p467) 1. Light received away from the incident beam is more heavily weighted in highfrequency (blue) ponents than the spectral distribution of the incident beam 2. Transmitted beam bees increasingly red in its spectral position, as well as diminishing in overall intensity 3. The blueness of the sky, the redness of the sunset, the waneness of the winter sun, and the ease of sunburning at midday in summer 4. Relative intensities: Zenith SunriseSunset Red (6500A) Green (5200A) Violet (4100A)
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