Home/ Raahithya/Answers
  1. Asked: In:

    When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  2. Asked: In:

    When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  3. Asked: In:

    Does sound follow the same laws of reflection as light does? Explain.

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  4. Asked: In:

    The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  6. Asked: In:

    A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s^–1.

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  7. Asked: In:

    Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  8. Asked: In:

    Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  9. Asked: In:

    Why is sound wave called a longitudinal wave?

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  11. Asked: In:

    Cite an experiment to show that sound needs a material medium for its propagation.

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1
  12. Asked: In:

    Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.

    Raahithya

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download. Please follow the link to visit website for first and second term exams solutions. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    Get Hindi Medium and English Medium NCERT Solution for Class 9 Science to download.
    Please follow the link to visit website for first and second term exams solutions.
    https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/

    See less
    • 1