(c17p18 Use the following values for mass and charge: an electron has mass me-9.

Question

(c17p18 Use the following values for mass and charge: an electron has mass me-9.11 x 10 31 kg and charge-e, a proton has mass mp-1.67x10-27 kg and charge +e, an alpha particle has mass malpha- 6.65x1027 kg and charge +2e, where e 1.60x10-19 C. An electron is released from rest in a vacuum between two flat, parallel metal plates that are 10.0 cm apart and are maintained at a constant electric potential difference of 690 Volts. If the electron is released at the negative plate, what is its speed just before it strikes the positive plate? Submit Answer Tries 0/99 What is the kinetic energy of the electron in units of ev? Submit Answer Tries 0/99

Explanation / Answer

a)
kinetic energy gained by electron, KE = workdone on the lectron

= q*delta_V

= 1.6*10^-19*690

= 1.10*10^-16 J (in Joules)

b) KE = e*delta_V

= e*690 V

= 690 eV (in eV)

1) true
2) false
3) true
4) false
5) true
6) flase
7) true

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.