What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source? diffraction Doppler effect reflection resonance.

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

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.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion