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Massachusetts Comprehensive Assessment System

2017, High School Intro Physics

Download PDF Document  Question 44: Open-Response  
When a child presses a button on a toy car, the car produces a long "beep" sound with a frequency of 500 Hz.
  1. Calculate the period, T, of the beep. Show your calculations and include units in your answer.
The sound of the beep travels through air at 340 m/s.
  1. Calculate the wavelength of the beep. Show your calculations and include units in your answer.
The child presses the button and pushes the toy car away. The car moves 5 m before it stops. It continues to beep, even after it stops moving.
  1. Describe what happens to the amplitude of the beep observed by the child as the car moves away from the child.
  2. When does the child hear a beep with a frequency lower than 500 Hz? Explain your answer.

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

ScoreDescription
4 The response demonstrates a thorough understanding of the properties of waves and the Doppler effect. The response correctly calculates the period and the wavelength of the sound. The response clearly describes how the amplitude is observed by the child as the toy car moves away. The response also clearly describes and explains when the child hears a beep with a frequency lower than 500 Hz.
4
3 The response demonstrates a general understanding of the properties of waves and the Doppler effect.
2 The response demonstrates a limited understanding of the properties of waves and the Doppler effect.
1 The response demonstrates a minimal understanding of the properties of waves and the Doppler effect.
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: Electromagnetism
Question 23: Heat and Heat Transfer
Question 32: Motion and Forces
Question 44: Waves and Radiation
Question 45: Motion and Forces

Return to the MCAS 2017 Student Work Directory



Last Updated: February 23, 2011
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