"Who can spread the voice" PPT

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"Who can spread the voice" PPT

Part 1: Understand the propagation of sound through experiments

How does sound reach our ears? medium

Purpose of the experiment: To prove that air can transmit sound.

Experimental equipment: two candles, a box of matches, a drum, and drumsticks.

experimental method:

(1) Light the candles, place one in front of the drum and the other farther away for comparison;

(2) Beat the drum and observe the phenomenon.

Experimental phenomenon: The flame of the candle will shake, and the flame close to the drum will shake violently.

Experimental conclusion: Air can transmit sound.

Can liquids carry sound?

Design experiments to test your ideas!

What materials are needed for the experiment?

Purpose of the experiment: To prove that liquid can transmit sound.

Experimental materials: tuning fork, sink, water.

Experimental process: Put the tuning fork into the water, strike the tuning fork, and put your ear close to the water tank.

Experimental phenomenon: The sound of the tuning fork can be heard.

Experimental conclusion: Liquid can transmit sound.

Can sound travel in a vacuum environment?

Discussion: Do gases, liquids, and solids propagate sound at the same speed? Can you verify it?

The speed of sound propagation in different media:

Vacuum 0m/s (that is, no propagation)

Air (15℃) 340m/s

Air (25℃) 346m/s

Cork 500m/s

Kerosene (25℃) 1324m/s

Distilled water (25℃) 1497m/s

Sea water (25℃) 1531m/s

Copper (rod) 3750m/s

Marble 3810m/s

Aluminum (rod) 5000m/s

Iron (rod) 5200m/s

Part 2 content: Discussion of issues

Discussion: What is the direction of sound propagation?

The direction of sound propagation is in all directions.

Think: How does sound travel?

Answer: Sound travels in the form of sound waves.

Why do we always see lightning first and then hear thunder?

Answer: Lightning and thunder occur at the same time, but light propagates much faster than sound in the air, so lightning is always seen first and thunder is heard later.

Part Three: Expansion Activities

Is it possible to hear sounds on the moon without any tools? Why?

Make a simple home phone.

play for fun:

After class, students can play with the simple phone you made and improve it.

Keywords: Qingdao version fifth grade science PPT courseware free download, Who Can Spread the Sound PPT download, .PPT format;

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Update Time: 2024-07-02

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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