Q3 - Sci 7 - Wk 4 - Waves Around You

Waves Around You

Quarter 3, Week 4

Objectives

• Explain the basic characteristics of sound waves using the concepts of wavelength, velocity, and amplitude.​

• Infer that waves carry energy.​

• Appreciate how sounds are produced in humans and other living organisms.​

Most Essential Learning Competency

Describe the characteristics of using the concepts of wavelength, velocity and amplitude.​

Multiple Choice

1. It is the distance between two consecutive crests or troughs of a wave.

• frequency

• amplitude

• wavelength

• velocity

Multiple Choice

2. The energy from the sun reaches the earth through ___________.

• infrared waves

• ultraviolet waves

• mechanical waves

• electromagnetic waves

Multiple Choice

3. Which of the following objects will produce sound?

• soft objects

• radio stations

• vibrating objects

• objects under pressure

Multiple Choice

4. A sound wave is a ______.

• longitudinal wave

• transverse wave

• standing wave

• A and C

Waves Around Us

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Open Ended

Why is it important for us to learn about waves?

The Nature of Waves

A wave is a periodic disturbance that moves away from a source and carries energy with it.

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^{It occurs when repetitive motion called vibration takes place.}

Open Ended

What are waves that you can think of that carries energy?

Waving hand

Strumming a guitar

Ripples of water​

A boy tapping his hand on the water.

Open Ended

How does a wave transfer/transmit energy from one place to another?

Wave Pulse

It refers to a single disturbance that will start a series of disturbances or waves.

Types of Waves

Transverse Waves

This happens when waves travel in a direction perpendicular to the direction of the wave movement.

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^{The movement of the wave is up and down and moves horizontally.}

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^{Examples: Infrared and Ultraviolet rays}

Longitudinal Waves

This happens when waves travel in a direction parallel to the direction of the wave movement.

^{Example: Sound waves}

Surface Waves

This happens when the waves travel both as transverse and longitudinal waves.

^{Surface wave, where the water particles move both horizontally and vertically to the direction of the wave movement.}

How do waves propagate?

Classification of Waves:

Mechanical Waves

Electromagnetic Waves

Mechanical Waves

Waves created require a medium for it to propagate.

Example: SOUND!

Electromagnetic Waves

Require no material medium for their passage. Thus, it can pass through empty space.

Example: The sun's ultraviolet rays

X-ray

Radio waves

PARTS OF A WAVE

Crest

Refers to the highest point of the wave.

Trough

Refers to the lowest point of the wave.

Amplitude

The maximum vertical displacement of the wave from its normal position.

Wavelength

The distance between any two successive crests or troughs.

Multiple Select

Which of the following are the parts of a wave?

• Amplitude

• Frequency

• Transverse Wave

• Crest

• Trough

SOUND!

Vibrations are regarded as disturbances that will eventually create the sound.

^{Sound waves created will travel to the ears of the listener and then interpreted by our brains.}

^{Sound needs a medium therefore it cannot travel in a vacuum.}

^{Sound is an example of a longitudinal wave and classified as a Mechanical Wave.}

Characteristics of Sound: Frequency

Wavelengths of sound can be determined through its frequencies. When there is high frequency, the wavelength of sound is smaller, while a low-frequency sound has a greater wavelength.

Frequency

Refers to the rate of vibration of the sound.

In sound, the frequency is also known as PITCH.

This parameter decides whether a sound is perceived as high pitched or low pitched.

Characteristics of Sound: Speed

Determines how fast or slow sound can travel.

It is dependent on the medium it travels through.

Sound travels fastest in solids and slowest in gas.

Speed of sound in air is also dependent on factors like temperature, humidity, and air pressure.

Characteristic of Sound: Amplitude

This is related to the loudness and intensity of sound.

Sound waves transmit different amounts of energy.

This energy is known as the Intensity of Sound.

Multiple Choice

Which has a high frequency?

Multiple Choice

Which has a softer sound?

Multiple Choice

In which medium can sound travel faster?

Multiple Choice

Which one has a high amplitude?

Multiple Choice

Which one has a short wavelength?

Group Learning Perfomance Task

Groupings of 7-8 students

Create a video/montage of each group member making a sound.

Tailor your interests through singing, dancing with music, speaking, poetry, creating music or rhythm thru instruments.​

Submit the output online thru link in the gc.

Deadline will be March 31, 2022.​

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Science

Performance Task