2. What do scientists call the vibration of molecules that creates sound? a. Waves b. Variables c. Amplitudes d. Noise 3. What is frequency? a. How often we hear sound b. The loudness of sound c. How quickly sound waves repeat d. Volume 4. What are the two types of sound waves? a. Transverse and adverse b. Kinetic and potential c. Longitudinal and transverse d. Longitudinal and transitional 5. What does amplitude measure? a. Volume b. Frequency c. Speed of the sound wave d. Length of the sound wave

Let's go through each question one by one and identify the correct answers based on scientific principles. ### Question 2: What do scientists call the vibration of molecules that creates sound? - **a. Waves**: This is a general term for disturbances that transfer energy. - **b. Variables**: This term refers to elements that can change in an experiment or equation. - **c. Amplitudes**: This refers to the maximum extent of a vibration or oscillation. - **d. Noise**: This is a term for unwanted sound but does not specifically refer to the vibration of molecules. **Correct Answer: a. Waves** Sound is created by the vibration of molecules, which generates waves. ### Question 3: What is frequency? - **a. How often we hear sound**: This is not a precise definition of frequency. - **b. The loudness of sound**: This refers to amplitude, not frequency. - **c. How quickly sound waves repeat**: This is the correct definition of frequency. - **d. Volume**: This refers to the perceived loudness of sound. **Correct Answer: c. How quickly sound waves repeat** Frequency is defined as the number of occurrences of a repeating event per unit of time. ### Question 4: What are the two types of sound waves? - **a. Transverse and adverse**: Transverse waves exist, but "adverse" is not a recognized type of wave. - **b. Kinetic and potential**: These are types of energy, not sound waves. - **c. Longitudinal and transverse**: This is correct; sound waves can be longitudinal (where the particle displacement is parallel to the direction of wave propagation) and transverse (where the displacement is perpendicular). - **d. Longitudinal and transitional**: "Transitional" is not a recognized type of sound wave. **Correct Answer: c. Longitudinal and transverse** These are the two main types of waves, with sound primarily being longitudinal. ### Question 5: What does amplitude measure? - **a. Volume**: Amplitude is related to volume, but it specifically measures the extent of the wave's displacement. - **b. Frequency**: This measures how often waves occur, not amplitude. - **c. Speed of the sound wave**: This is a different property entirely. - **d. Length of the sound wave**: This refers to wavelength, not amplitude. **Correct Answer: a. Volume** Amplitude is a measure of the maximum displacement of a wave, which correlates to the volume of the sound. ### Summary of Correct Answers: 2. a. Waves 3. c. How quickly sound waves repeat 4. c. Longitudinal and transverse 5. a. Volume