Chapter 40467P40.10We take θ=00300.radians. Then the pendulum’s total energy isEmghmgLLE==−=−=×−cos.....afbgej1 009 801 00 0 999 54 41 103kgm sJ2The frequency of oscillation isfgL=ωππ2120498. Hz.The energy is quantized,Enhf=.Therefore,nEhf××⋅=×−−−441 10134 103131...J6.626 10J ss34ejFIG. P40.10P40.11The radiation wavelength of ′ =λ500 nm that is observed by observers on Earth is not the truewavelength, , emitted by the star because of the Doppler effect. The true wavelength is related tothe observed wavelength using:ccvc′=−+λλ11:=′−+=−+=1150010280280375afnmnm...The temperature of the star is given bymax.T⋅−2898 103mK:T=−3.max:T=×−−375 10773 10393..K.P40.12Planck’s radiation law isIThcehck Tπ,=−2125B.Using the series expansionexxxx=++ + +123!!….Planck’s law reduces tohchck Thchck Tck T,bg bg=++
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .