Question

Someone may you please help me with two questions Thankss!


Which example below of light behavior best matches the behavior of a sound wave when you hear an echo?

Question 16 options:

A pencil looking bent in a glass of water.


A person looking in the mirror


Light waves bending when the move from the air into the water


A light wave heating a roof.



Second question is A speaker was giving a speech to a class of students. The sound waves present are diagrammed below:



What best explains what happened to sound wave A?

Question 15 options:

The sound wave was absorbed by the yellow material on the wall.


The sound wave stopped and transmitted.


The sound wave was reflected to the students.


The sound wave was absorbed by the air molecules.


Picture if for part 2

Answer 1

For the 1st one.

Echo means reflection of sound. Therefore the answer is a person looking in the mirror (as this is the only answer that does not hav refraction)
And for part 2
The sound was absorbed by the yellow material.

Answer 2

Answer:

1. Option A person looking in the mirror

2. The sound wave was absorbed by the yellow material on the wall.

Explanation:

Thinking process:

The properties of light and sound are the same in some respects. For example, sound waves are reflected back to the source. Similarly, light waves are also reflected back to the original source. The refection of light on a smooth surface results in the mirror image being formed in the image.

The padding on the wall results in the waves being absorbed by the wall. This results in the sound waves being absorbed by the walls to reduce reverberation that might cause noise.