Listening to reflected sound in Sound – Class 9 Science Experiment

Chapter Name: Sound

Activity Name: Listening to reflected sound in Sound

Activity Description:

Demonstrating types of wave propagation in Sound - Class 9 Science Experiment
Demonstrating types of wave propagation in Sound - Class 9 Science Experiment

In this experiment, you will explore the reflection of sound by using two long, identical tubes placed near a wall. By speaking softly into one tube and listening through the other tube, you will observe how adjusting the angles of the tubes affects the quality of the reflected sound.

Additionally, you will test how different materials placed against the wall influence the reflected sound.

Required Items:

  1. Two long, identical tubes
  2. Wall
  3. Flat objects made of different materials (steel and plastic trays, cardboard, cloth-draped tray, etc.)

Step by Step Procedure:

  1. Place the two long, identical tubes on a table near a wall.
  2. Ask your friend to speak softly into one tube while you use the other tube to listen.
  3. Adjust the angle of the listening tube until you hear the best sound.
  4. Note the angle at which the tubes are positioned for the best sound clarity.

Experiment Observations:

  1. You will find that you hear your friend’s voice best when the tubes make equal angles with a normal to the wall.
  2. If you lift one of the tubes slightly above the table, you will not be able to listen to the sound clearly. The incident and reflected sound-carrying planes will no longer be in the same plane, leading to unclear sound.

Precautions:

  1. Handle the tubes and objects with care to avoid any damage.
  2. Ensure that the tubes are identical in length and shape for accurate results.
  3. Speak softly into the tube to maintain consistent sound levels.

Lesson Learnt from Experiment:

The experiment demonstrates that the reflection of sound follows similar laws as the reflection of light. When sound is reflected, the incident and reflected sound directions make equal angles with the normal to the reflecting surface.

Adjusting the angles of the tubes allows you to hear the best-reflected sound. Lifting one of the tubes disrupts the alignment of the incident and reflected sound-carrying planes, resulting in unclear sound.

Science Experiment Kits for Kids

Photo Title Price Buy
Einstein Box Junior...image Einstein Box Junior Science Gift Set | 2-in-1 Set of My First Science Kit & Slime Kit for 4-6-8 Year Olds| Birthday Gift for Boys & Girls ₹1,199.00
ButterflyEdufields 20+ Science...image ButterflyEdufields 20+ Science Kit For Kids | STEM Projects birthday gift For Boys and Girls Ages 7-8-10-12 |DIY Educational & Learning Experiment Toys for 7 To 12 Year Olds | Build 20+ Motor Machines ₹1,699.00
The Little Ones...image The Little Ones Science Kit - Science experiment kit for kids 6-8-10-12 years old,educational learning toys,Best gift for boys&girls,chemistry kit,science project[Complete science kit- 100+experiment] ₹889.00
WitBlox AI Artificial...image WitBlox AI Artificial Intelligence Robotic Science Kit for 101+ Project 137 Part 8 Yrs+, Interlocking Bricks, Electronic Sensor & Circuits to create Logic 2 Free Live Classes Gift Toy for Boys & Girls ₹3,220.00
Avishkaar Robotics Advanced...image Avishkaar Robotics Advanced Kit|150-In-1 DIY Stem Metal Kit|Multicolor|150+ Parts|Learn Robotics|Coding & Mechanical Design|for Kids Aged 10-14|Made in India|Educational DIY Stem Kit|Made in India ₹10,399.00
My Science Lab...image My Science Lab Ultimate Science Experiment Kit for Kids Age 6-14 | STEM Toys | Physics Kit Set | Science & Fun 5-in-1 Projects | School Science Kit | Best Educational Birthday Gift Toys for Boys and Girls ₹1,199.00

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *