Learning Task 7. Answer the questions briefly Write True if the statement is correct and False if the statement is incorrect.
_1. Light can be reflected if it is directed towards a mirror.
_2. The speed of light remains the same even if it travels from one
material to another.
_3. Sound could be either soft or loud.
_4. The loudness of sound decreases as it moves nearer the
observer.
_5. Echo is the term used for the sound that is reflected back to its
source​

1. True.

2. True.

3. True.

4. False.

5. True.

Explanation:

Light wave can be defined as an electromagnetic wave that do not require a medium of propagation for it to travel through a vacuum of space where no particles exist.

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.

Sound travels faster through solids than it does through either liquids or gases.

1. True: Light can be reflected if it is directed towards a mirror. A mirror that is typically made of ordinary glass and has a flat reflecting surface.

Reflection can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.

Simply stated, reflection occurs when a ray of light or wavefronts bounces off a smooth surface such as a plane mirror.

2. True: The speed of light remains the same even if it travels from one material to another. The speed of light is 3 * 10⁸ meters per seconds and it's a constant regardless of medium of propagation.

3. True: Sound could be either soft or loud.

A soft sound typically has a low volume while a loud sound posseses a high volume. An example of a soft sound is the sound from a piano while an example of a loud sound is a train's horn.

4. False: The loudness of sound decreases as it moves nearer the observer.

The loudness of a sound is directly proportional to the square of the amplitude of the sound and as such the loudness of sound increases as it moves nearer the observer.

5. True: Echo is the term used for the sound that is reflected back to its source.

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according to my research (britannica and quizlet) the first settlements were along the huang river because it could give the crops more fertile soil that really it out. this was due to the yellow slit caused by floods of the river.