Sound is produced when a matter vibrates. Sounds consists waves and these waves travel as a longitudinal waves. Sound travels fastest in solids because the particles are closer. The speed of sound depends on the temperature of matter. The higher the temperature, the higher the speed of sound is. The properties of sound are reflection and refraction. In reflection, the sound wave turns back when it hits a barrier. A good example of this are echoes and reverberations. On the other hand, refraction is the bending of sound waves.
Waves (Grade 7, Quarter 3) Suggested Guide for DiscussionRachel Espino
A suggested powerpoint presentation guide for discussion for Gr.7 teachers on the characteristics and categories of waves. It also includes a simple quiz (under knowledge category) as an assessment
Energy is the ability to do work.
Everything that happens in the world uses energy!
Most of the time we can’t see energy, but it is
everywhere around us!
Waves (Grade 7, Quarter 3) Suggested Guide for DiscussionRachel Espino
A suggested powerpoint presentation guide for discussion for Gr.7 teachers on the characteristics and categories of waves. It also includes a simple quiz (under knowledge category) as an assessment
Energy is the ability to do work.
Everything that happens in the world uses energy!
Most of the time we can’t see energy, but it is
everywhere around us!
“HEAT”
Heat is a form of energy that flows from warmer bodies to colder bodies.
It is viewed as a form of energy that is transferred from one body to another due to a difference in temperature.
The SI unit of heat is joule (J).
Common unit of heat is calorie.
CALORIE the amount of heat needed to change the temperature of one gram of water from the pressure of the atmosphere.
TEMPERATURE
LAYMAN’S TERM
- It is the degree of hotness or coldness of an object.
Molecular level
- A measure of the average kinetic energy of these molecules.
Based from our sensory experiences:
“Can we use our senses to determine temperature?”
THERMOMETER
TYPES OF THERMOMETER
The most common type of the thermometer.
THERMOCOUPLE
-two different metals (usually copper and iron) that are twisted together
INFRARED THERMOGRAMS
-a device (camera) that measures the amount of radiant energy given off by an object
TEMPERATURE SCALES
TEMPERATURE SCALES
“HEAT”
Heat is a form of energy that flows from warmer bodies to colder bodies.
It is viewed as a form of energy that is transferred from one body to another due to a difference in temperature.
The SI unit of heat is joule (J).
Common unit of heat is calorie.
CALORIE the amount of heat needed to change the temperature of one gram of water from the pressure of the atmosphere.
TEMPERATURE
LAYMAN’S TERM
- It is the degree of hotness or coldness of an object.
Molecular level
- A measure of the average kinetic energy of these molecules.
Based from our sensory experiences:
“Can we use our senses to determine temperature?”
THERMOMETER
TYPES OF THERMOMETER
The most common type of the thermometer.
THERMOCOUPLE
-two different metals (usually copper and iron) that are twisted together
INFRARED THERMOGRAMS
-a device (camera) that measures the amount of radiant energy given off by an object
TEMPERATURE SCALES
TEMPERATURE SCALES
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
4. Activity: Humming a Tune
▰Procedures:
Place your fingers on your throat and
hum your favorite song for 1 minute.
Questions:
▰What did you observed?
▰What did you feel when you hum?
▰How do you think your vocal chords make a
sound? 4
5. “Sound is produced when
matter vibrates. These
vibrations travel outwards
from the source.
55
6. Sound consists of waves and
these waves travel as a
longitudinal wave.
7. LONGITUDINAL WAVE
▰Longitudinal Waves are waves that are usually created by
pulling and pushing the material or medium. Alternating
compressions and rarefactions are observed.
7
8. LONGITUDINAL WAVE
▰These compressions and rarefactions move along with the
direction of the pushing and pulling activity of a material. Thus, the
wave moves parallel to the motion of material or the particles of the
medium.
8
9. LONGITUDINAL WAVE
▰The distance from one compression to the next or between two
successive compressions in a longitudinal wave is called wavelength.
9
10. LONGITUDINAL WAVE
▰If you count the number of compressions passing by a certain point
in 1 second, you are able to determine the frequency of a longitudinal
wave.
▰The greater the frequency, the higher the pitch
10
11. TRANSVERSE WAVE
▰ The movement of particles is perpendicular to the direction of
wave travel. The compressions resemble the trough while the
rarefactions are the crest.
11
Examples of transverse
waves include: ocean waves
electromagnetic waves –
light waves, microwaves,
radio waves.
14. 14
▰Sound waves that travel in air come in contact
with our eardrums causing it to vibrate.
▰People hearing sounds while submerged in a
pool is evidence sound travels through a liquid.
▰People hearing sounds with their ear pressed
against a table is evidence sound travels through
a solid.
NOTE!
▰People unable to hear sounds in a vacuum is evidence
sound requires a medium like solids, liquids and most
gases to travel.
15. Where does the sound
travel fastest: solid,
liquid or gas?
15
20. 20
The hotter the medium the faster the sound travels
▰With more collisions per unit time, energy is transferred
more efficiently resulting in sound traveling quickly.
21. The hotter the medium the faster the sound travels
▰ Speed of sound is directly affected by the temperature of
the medium.
▰Heat, just like sound, is a form of kinetic energy. At higher
temperatures, particles have more energy (kinetic) and thus,
vibrate faster. And when particles vibrate faster, there will be
more collisions per unit time.
▰With more collisions per unit time, energy is transferred
more efficiently resulting in sound traveling quickly.
21
22. 22
▰Sound travels at about 331
𝑚
𝑠
in dry air at 0˚ C. The speed of sound
is dependent on temperature of the medium where an increase is
observed with an increase in temperature.
▰T is the temperature of air in Celsius degree and 0.6
𝑚/𝑠
𝐶
is a
constant factor of temperature. Let’s try it out at a room temperature
of 25˚Celsius.
29. REVERBERATION
▰The prolongation of the reflected
sound is known as reverberation.
▰Reverberation refers to the
multiple reflections or echoes in a
certain place.
▰A reverberation often occurs in a
small room with height, width, and
length dimensions of approximately
17 meters or less. 29
30. ECHO SOUNDING
▰Echo sounding is used to map the
ocean floor and to determine the depth
of the ocean or sea by
transmitting sound waves into water.
▰Bats listen to the echoes to figure
out where the object is, how big it is,
and its shape or detect distances.
30
32. REFRACTION
▰Refraction is described as the change in speed
of sound when it encounters a medium of
different density.
▰This change in speed of sound during
refraction is also manifested as sort of
”bending” of sound waves.
32
33. 33
▰Sound waves propagating through air are bent and
undergo refraction when the air temperature varies (the higher
the temperature, the greater the speed of sound).