Arush Kumar

Asked: October 28, 2020In: Class 9

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

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-3

Arush Kumar

Asked: October 28, 2020In: Class 9

Why is sound wave called a longitudinal wave?

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-4

Arush Kumar

Asked: October 28, 2020In: Class 9

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

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-5

Arush Kumar

Asked: October 28, 2020In: Class 9

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

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-6

Arush Kumar

Asked: October 28, 2020In: Class 9

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.

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-7

Arush Kumar

Asked: October 28, 2020In: Class 9

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

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-9

Arush Kumar

Asked: October 28, 2020In: Class 9

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

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-10

Arush Kumar

Asked: October 28, 2020In: Class 9

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?

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-11

Arush Kumar

Asked: October 28, 2020In: Class 9

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?

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-11

Arush Kumar

Asked: October 28, 2020In: Class 9

Give two practical applications of reflection of sound waves.

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-174 Questions No-12

Arush Kumar

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