You are standing some in front of two speakers. They emit identical sound waves at the same frequency so that you One speaker is moved towards you a distance of 40 cm. The sound that you hear changes from from maximum loudness to no sound at all (destructive interference). If the speaker is moved an additional 80 cm towards you what statement is true? O Not enough information. You will hear no sound. O The sound is half as loud. O You will hear maximum loudness.

A student added recorded measurements of 8.0 cm, 8.01 cm and 9.00 cm. (a) How many significant figures are in each value? (b) How should he report his result using the correct number of significant figures?

The mass of an object was measured eight times on a balance readable to +1 g, and the followng values were recorded: (298 + 1)g. (311 + 1)g. (302 + 1)g, (312 + 1)g, (313 + 1)g, (317 + 1)g, (302 + 1)g, and (331 + 1)g. Find the final measurement ± m Select one: O a (310.75 + 4) g O b. (311 ±3.71) g O C. (311 +4) g O d. (310.75 +3.712) g