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# Massachusetts Comprehensive Assessment System

## 2016, High School Intro Physics

 Question 12: Open-Response Reporting Category: Waves and RadiationStandard: 4.5 - Recognize that mechanical waves generally move faster through a solid than through a liquid and faster through a liquid than through a gas. The graph below shows the relationship between distance and time for a sound wave moving through a liquid.Calculate the speed of the sound wave. Show your calculations and include units in your answer.  Copy the graph onto the grid in your Student Answer Booklet. On your graph:Label the line you copied "liquid."Draw a line labeled "gas" to represent how this sound wave would travel through a typical gas.Draw a line labeled "solid" to represent how this sound wave would travel through a typical solid.Explain your reasoning for the placement of the new lines (gas, solid) you drew in part (b). Identify one property or characteristic of a sound wave that remains the same when it moves from a liquid into a gas or a solid.

### Scoring Guide and Sample Student WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of the speed of mechanical waves and how mechanical waves generally move faster through a solid than through a liquid and faster through a liquid than through a gas. The response correctly calculates the speed of the sound wave and correctly graphs and explains the lines to represent sound moving through a solid and a gas. The response also correctly identifies a property or characteristic that remains the same when a sound wave moves from a liquid to a solid or a gas.
4
3 The response demonstrates a general understanding of the speed of mechanical waves and how mechanical waves generally move faster through a solid than through a liquid and faster through a liquid than through a gas.
2 The response demonstrates a limited understanding of the speed of mechanical waves and how mechanical waves generally move faster through a solid than through a liquid and faster through a liquid than through a gas.
1 The response demonstrates a minimal understanding of the speed of mechanical waves and how mechanical waves generally move faster through a solid than through a liquid and faster through a liquid than through a gas.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

### High School Intro Physics

Question 12:
Question 23:
Question 32:
Question 44:
Question 45:

Return to the MCAS 2016 Student Work Directory

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