Class 9 Science Exam Part 3 Questions

Class 9 Science Exam Pt 3 Questions Paper

• Designed for 9th-grade students
• Purpose: to assess students' knowledge and understanding of scientific concepts in Class 9
• Format: consists of multiple-choice questions, short-answer questions, and long-answer questions

Sound Energy

• A form of mechanical energy that produces vibrations in the air particles
• Sound energy is a type of kinetic energy

Sound Production in a Flute

• Produced when air is blown across the embouchure hole, causing the air column inside the flute to vibrate
• The vibrations produced by the air column create sound waves

Sound Propagation

• Requires a medium, such as air, water, or solid objects, to transmit sound waves
• Sound waves cannot propagate through a vacuum

Human Voice Production

• Produced by the vibration of the vocal cords in the larynx (voice box)
• When air from the lungs passes through the glottis, the vocal cords vibrate, producing sound waves

Object Sound Production

• Requires an object to vibrate, producing sound waves
• Vibration of the object creates disturbance in the air particles, which then transmit the sound waves to the surrounding environment