1. when a homemade oil and vinegar salad dressing is left standing, it separates into layers. the salad dressing is a? solution,
suspension, colloid, compound 2.which of the following is not an example of a physical property? density, hardness, flammability, melting point 3. which material is a poor conductor of heat? iron, wood ,silver, copper
<span>The salad dressing is known as a compound dressing. A compound is simply a combination, or mixture, of two or more ingrediants. Physical properties include, density, hardness, melting, and boiling points. Flammability is considered a chemical property along with vapor, concentration, etc. Wood is not a reliable conductor for heat, while Copper is considered the best.</span>
I think so it ans wold be d.because if the source approaches the observer more and more wavefront will pass and it get squeezed.so wavelength decreases and frequency increases.
