When snooping around, Ms. Vaughan discovered that she could hear her parents' conversations a lot better if she put her ear directly on the door compared to when her ear was just really close to the door. Use the words sound waves, medium, solid, and gas to explain to Ms. Vaughan the physics behind her observation. EXPLAIN FULLY IN AT LEAST 3 SENTENCES.

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

If element x has 99 protons how many electrons does it have

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)