物理实验报告.doc

1 2 yyxxyvy=uym.sinwtvx=uxm.t,vy xd-2thf-157-16 1 yv/div ,0.2v/divt/div 2m.sy=5.0div,x=10.0divyxlevelyxy50d.v ,x10.0div, 2 1aclocac 2y 3v/div t/divlevel4t/div 3 v/div4 ttdx.divt/div0.5div t=0.5ms/div.dxdiv5 vp-1fy 6 xext.xyxo-22xnx,ny1121311213:1 2 3 1 v=v01+t/t0 (1)v0 t0t0=273.15k t2v=f. (2)fv0 . 1 t1 2 1 2 3 ,f.4 x1x2x3x4121 t=24.5c t=24.5cf0=35.455khz f0=35.435khz f=(35.455+35.435)/2=35.445khz v=f*=357.64m/s 2 v=v01+t/t0=331.451+(t+t)/2*273.15=345.99m/s 3 ur=uv/v=(uf/f)2+(u/)2 uf/f=0.5 ua=i)2/n-1=0.035=0.001ub=0.002/u=ua2+ub2=0.0354 ur=uv/v=0.035uv=ur*v=0.035*345.99=12.11m/s vuv=345.9912.11m/sv=vvt=357.64-345.99=11.65m/s er=v/vt*100%=11.65/357.99 *100%=3.2%1 2 3 hene12m1m2,m1m2g1,g1m1m2e12e hene g1m1m2m2m2m1m1,m2m2m1m2g1ehm2m1m2m1m1m2d m1 k, m, d, : =2d/ki=2d/k*5=2*0.0495/30*5=6.605*10-4mmua=ub=10-4/n-1=1,09*10-4mm=0.58*10-4mm- 42 ud=ua2+ ub2=)+(0.58*10-4)2=1.23*10-4mmu=2u0d/k*5=1.6*10-6mm =660.51.6mmur= u/ *100%=1.6/160.5 *100%=0.24%e0=0/0=660.5632.8/632.8 *100%=4.38%1 2 1 khbaaddaaifb: fb=evbddafefbeddvh,b fe=ee=evh/bfbfeevb=e*vh/bn,i=nev*s=neub*d (d) v=i/nebd vh=1/ne *ib/d=rh*ib/d=khib kh=vh/ibrh=1/nekh=rh/d=1/ned 2 kh=vh/ib b=vh/ikhkhivhb,vhvevrlvnbivhvhvav0vevrlvnib+b,+i,(-b,-i),(-b,+i), (-b,-i)vvhvav0vevrlvnb=(vs2.500)/ksss495a 1 usbb=(vs-2,500)/ksks 1 22.500vk114.85.22.500v.30250ma25mavs,2 2.500v2.500vvbb=v/k,200mabxk2,k122.42.6v v=(v1+v2)/2vs=ks*u0*