Potential Energy of Point-Charges: If an Electron Is Accelerated from Rest

question 17

Multiple Choice

Potential energy of point-charges: If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10^-19 C, k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C², ^m_el = 9.11 × 10^-31 kg)

• A) 5.9 × 10⁷ m/s
• B) 4.9 × 10⁷ m/s
• C) 3.9 × 10⁷ m/s
• D) 2.9 × 10⁷ m/s

---

Definitions:

Tonsil

Small masses of lymphatic tissue located at the back of the throat that help in fighting off infections.

Pharyngeal

Relating to the pharynx, the part of the throat behind the mouth and nasal cavity.

Lingual

Lingual pertains to the tongue, often regarding its anatomical structure, functions, or associated phenomena like lingual nerves or lingual tonsils.

Palatine

Pertaining to the palate, especially referring to bones or structures associated with the roof of the mouth.