[填空题]
The circuit shown in (Fig. Below j74pl jo)q.xjpx7tn- a) uses a neon-filled tube as in (Fig. qi,b glaatq- 5:y3la7:,p ( vtem4agn:3 qtwc Below b). This neon ,gl:,at 3 pq4y bvtit:qac7g( m5na w-aql:3elamp has a threshold voltage $V_0$ for conduction, because no current flows until the neon gas in the tube is ionized by a sufficiently strong electric field. Once the threshold voltage is exceeded, the lamp has negligible resistance. The capacitor stores electrical energy, which can be released to flash the lamp. Assume that $C=0.150\mathrm{~}\mu\mathrm{F},R=2.35\times10\mathrm{~}^6\Omega,V_0=90.0\mathrm{~V}$ and Ann meter=105 V
(a) Assuming that the circuit is hooked up to the emf at time $t\,=\,0$, at what time will the light first flash? s
(b) If the value of R is increased, will the time you found in part (a) increase or decrease?
(c) The flashing of the lamp is very brief. Why?
(d) Explain what happens after the lamp flashes for the first time.
a
b