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Propagation of Sound waves — Important Questions

ICSE · Class 9 · Physics

40 important questions from Propagation of Sound waves for ICSE Class 9 Physics, with answers. Includes multiple choice and multiple correct questions.

40 questions36 flashcards6 formulas & key relations5 concepts

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A labeled diagram showing a stretched string being plucked, illustrating how its vibrations produce sound. The string should be shown in its resting and vibrating states.
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40 Questions·
multiple choicemultiple correct

Important Questions from Propagation of Sound waves

1multiple choice

What is the audible range of frequency for humans?

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20 Hz to 20,000 Hz

The human ear can detect sound frequencies from 20 Hz to 20,000 Hz (20 kHz). Sounds below 20 Hz are infrasonic, and sounds above 20 kHz are ultrasonic, both of which humans cannot hear.

2multiple correct

Which factors affect the speed of sound in air?

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Temperature, Humidity, Wind direction

Temperature, humidity, and wind direction all affect sound speed in air. Higher temperature increases speed, humidity increases speed, and wind can increase or decrease speed depending on direction. Amplitude and pressure do not affect sound speed.

3multiple choice

Ultrasonic waves have frequency:

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Above 20,000 Hz

Ultrasonic waves have frequencies above 20,000 Hz (20 kHz), which is beyond human hearing range. These waves are used in medical imaging, cleaning, and SONAR applications due to their high energy and directional properties.

4multiple choice

Why do we see lightning before hearing thunder?

Show answer

Light travels much faster than sound

Light travels at 3×10⁸ m/s while sound travels at only 330 m/s in air. This huge difference means light reaches us almost instantly while sound takes time to travel the same distance, causing the delay between seeing lightning and hearing thunder.

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Frequently Asked Questions

What are the important topics in Propagation of Sound waves for ICSE Class 9 Physics?
Key topics in Propagation of Sound waves include Production of Sound, Sound Needs a Material Medium, Propagation of Sound in a Medium, Basic Wave Terms and Relations. Study these first, then practise questions on each for Class 9 exams.
How many important questions are there in Propagation of Sound waves?
Super Tutor has 40 practice questions for Propagation of Sound waves, including multiple choice, multiple correct questions. A sample with answers is on this page.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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