Abeam of light is traveling in air and strikes a material. the angles of incidence and refraction are 63.0° and 47.0° respectively. obtain the speed of light in the material.

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving