# Difference between revisions of "Course:PHYS341/2018/Assignments/A1"

## Part 1

Basic Concepts. For questions 1 to 3, fill in the gaps in each paragraph, choosing from the set of words/phrases at the end of each question (each of which may be used more than once) to form the most correct, precise statements. In the case where two words can be interchanged with no change in meaning, place them in alphabetical order (the code cannot handle more than one correct answer!).

1.

 In colloquial use, the term "noise" refers to sound. In science of acoustics, "noise" means sound with no particular or content that tends to obscure the sound of interest. amplitude, frequency, information, loud, random, quiet, unwanted.

2.

 "Music" means many things to different people, but basically it is , in a meaningful way. culturally, deliberately, harmonically, organized, pressure, sound, sung, technically, written.

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{ |type="{}"} "Vibration" means the regular back-and-forth movement of an object that can be defined by its { amplitude } (i.e. the maximum { distance } it moves from equilibrium) and { frequency } (the number of complete oscillations in a given { time }).

amplitude, buzz, distance, frequency, pressure, sound, time, wavelength. </quiz>

## Part 2

For the following questions, select all statements that are correct. There may be more than one.

1. A travelling wave permanently transports (i.e. not just a back and forth oscillation) what from one place to another?

 (a) Air → No - no matter is permanently moved (b) Atoms → No - no matter is permanently moved (c) Energy → Correct (d) Information → Correct

2. The "frequency" of a wave means:

 (a) How often a sound happens → Too vague (b) The distance between two successive wave crests. → No, that's the wavelength (c) The time between two successive wave crests. → That's the period (d) The number of wave crests that pass in a given time period. → Correct

3. The "wavelength" of a wave means:

 (a) Where a sound happens → Too vague (b) The distance between two successive wave crests. → Correct (c) The distance between two successive wave troughs. → Also correct (d) The number of wave crests that pass in a given time period. → No, that's the frequency

4. The "amplitude" of a wave means:

 (a) How far apart the waves are → No (b) The distance between two successive wave crests. → No, that's the wavelength (c) The maximum distance from the equilibrium (no wave) position. → Correct (d) The number of wave crests that pass in a given time period. → No, that's the frequency

5. For a wave, the wavelength multiplied by the frequency is:

 (a) The wave speed → Correct (b) The amplitude. → No (c) The energy. → No (d) The speed of the particles of the medium. → No

6. In a transverse wave:

 (a) The particles of the medium travel at the wave speed. → No (b) The particles of the medium oscillate in the wave direction. → No (c) The particles of the medium oscillate at 90 degrees to the wave direction. → Correct (d) The particles of the medium migrate in the direction of the wave → No, that's the frequency

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