Question

7 multiple choice 2 points which type of wave requires a material medium through which to travel? radio wave microwave light wave mechanical wave 8 multiple choice 2 points which type of electromagnetic radiation is responsible for sunburns? gamma rays x - rays microwaves ultraviolet rays 9 multiple choice 2 points engineers are designing an auditorium that will be used for performances by orchestras. what must they do to maximize the loudness of the sound heard by the audience? hang curtains behind the orchestra put carpet all around the walls of the auditorium hang reflecting panels from the ceiling behind the orchestra install narrow glass windows and skylights around the top of the walls

Explanation:

• Question 7: Radio waves, microwaves, and light waves are electromagnetic waves that can travel through a vacuum. Mechanical waves, such as sound waves, require a material medium (solid, liquid, or gas) to travel.
• Question 8: Gamma rays and X - rays have very high energy and are not the main cause of sunburns. Microwaves have low energy. Ultraviolet (UV) rays, especially UV - B rays, are responsible for sunburns as they can damage the skin cells.
• Question 9: Hanging curtains, putting carpet, or installing glass windows and skylights (which can absorb or let out sound) will not maximize sound loudness. Hanging reflecting panels from the ceiling behind the orchestra will reflect the sound waves towards the audience, increasing the loudness of the sound heard by the audience.

Answer:

1. mechanical wave
2. ultraviolet rays
3. hang reflecting panels from the ceiling behind the orchestra