Avelocity selector consists of electric and magnetic fields described by the expressions e = e k and b = b ĵ, with b = 12.0 mt. find the value of e (in kv/m) such that a 770 ev electron moving in the negative x-direction is undeflected.

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

Apossible explanation for a set of facts that can be tested by further investigation is called

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?