EFFECT OF TEMPERATURE TO THE SPEED OF SOUND.pptx

the effect of temperature to the speed of sound

1. SCIENCE 8 SCIENCE 8 QUARTER 1 WEEK 6 Module III: SOUND Lesson 17: EFFECT OF TEMPERATURE TO THE SPEED OF SOUND

2. Review Why does sound travel faster in solids than in liquids, and faster in liquids than in gases (air)? It is easier for sound waves to go through solids than through liquids because the molecules are closer together and more tightly bonded in solids. Similarly, it is harder for sound to pass through gases than through liquids, because gaseous molecules are farther apart.

3. Picture Analysis

4. Picture Analysis Any similarities and differences that you can give about the picture?

5. Picture Analysis How about the arrow on the picture, what does it tell about sound?

6. Objective: Determine how temperature affects the speed of sound.

7. Activity Faster sound… In hotter or cooler?

8. Guide Questions: 1. Which cylinder gave the loudest sound? 2. Which cylinder gave the highest pitched sound? 3. If pitch is directly dependent on frequency, then, which cylinder gives the highest frequency sound?

9. Guide Questions: 4. Since wave speed is directly dependent on frequency, then, which cylinder gives the fastest sound? 5. How would you relate the temperature of the medium with the speed of sound?

10. Why do we hear loud sound of music on a hot day than on rainy day? Because sound waves move faster in warm air especially on a hot day and slower in cold air specifically on a rainy day

11. Temperature is a condition that affects the speed of sound. Heat, like sound, is a form of kinetic energy. Molecules at higher temperatures have more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. The speed of sound in room temperature air is 346 meters per second. This is faster than 331 meters per second, which is the speed of sound in air at freezing temperatures. For every degree rise in temperature, the increase in the speed of sound is 0.6m/s. At 0 C, the speed of sound in air is 331m/s. At 10C, the speed will become 331.6m/s.

12. This is determined by the use of the equation: v = 331m/s + (0.6m/s C) T where: v is the speed of sound T is the temperature of the air. At a temperature of 1 C V = 331m/s + (0.6m/s C) (1 C) V = 331.6 m/s.  

13. From the above figure, notice that the speed of sound varies directly with the temperature-as the temperature increases, the speed of sound also increases.  

14. One thing to keep in mind is that this formula finds the average speed of sound for any given temperature. The speed of sound is also affected by other factors such as humidity and air pressure.

15. Evaluation: Direction: Choose the letter of the correct answer.

16. 1. How would you relate the temperature of the medium with the speed of sound? A. The higher the temperature, the faster the sound travels. B. The higher the temperature, the slower the sounds travel. C. The lower the temperature, the faster the sound travels. D. The lower the temperature, the slower the sound travels.

17. 2. What is the speed of the sound in air of 25 C temperature? A. 336m/s B. 325m/s C. 346m/s D. 355m/s

18. 3. Calculate the speed of sound if the temperature of the vibrating water is 28°C? A. 346m/s B. 347.8m/s C. 350m/s D. 349.1m/s

19. 4. In which of the following will the movement of particles be the fastest? A. 30°C of water B. 50°C of water C. 70°C of water D. 90°C of water

20. 5. Which of the following quantities tells how hot or cold an object is with respect to some standard? A. Density B. Mass C. Pressure D. Temperature