# Sparks - when it collides with the atom atomic radius ~...

This preview shows pages 1–8. Sign up to view the full content.

Qsparks.1 What factors should influence the MEAN FREE PATH of a particle in air? A) air density B) size of an air molecule C) particle speed 1) A only 2) B only 3) C only 4) A & B 5) A, B, & C

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Qsparks.2 Calculate approximately the mean free path of an electron in air. 1) 4e-28 m 2) 7e-20 m 3) 5e-7 m 4) 2e6 m
Qsparks.3 How is charge transferred from one charged sphere to another in a spark? 1) electrons jump across the gap 2) protons jump across the gap 3) electrons and positive ions drift in ionized air

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Qsparks.4 Estimate the magnitude of the electric field required to pull an electron out of an atom. atomic radius ~ 1e-10 m 1) 2.3e-18 N/C 2) 2.3e-8 N/C 3) 14.4 N/C 4) 3e6 N/C 5) 1.4e11 N/C
Qsparks.5 Calculate the minimum kinetic energy a particle must have to be able to knock an electron out of an atom

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: when it collides with the atom. atomic radius ~ 1e-10 m 1) 2.3e-18 J 2) 2.3e-8 J 3) 14.4 J 4) 3e6 J 5) 1.4e11 J Qsparks.6 Electron starts from rest. Its final kinetic energy is 2.3e-18 J. What is the potential difference | Δ V| through which it was accelerated? 1) 3.7e-37 V 2) 1.6e-19 V 3) 2.3e-18 V 4) 7.0e-2 V 5) 14 V Qsparks.7 Electron travels one "mean free path" (~5.3e-7m) through a potential difference of 14 V. What is the electric field in the region? 1) 7.4e-6 V/m 2) 2.6e7 V/m 3) 1.2e-24 V/m 4) 4.2e-12 V/m 5) 3e6 V/m Qsparks.8 Testing the model: Mean Free Path is inversely proportional to air density. If air density is INCREASED, will this change the E needed for a spark? 1) E critical should increase 2) E critical l should decrease 3) E critical should stay the same...
View Full Document

{[ snackBarMessage ]}

### Page1 / 8

Sparks - when it collides with the atom atomic radius ~...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online