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Sneha Thakur

Asked: October 29, 2020In: Class 10

To warn ships for underwater rocks, a lighthouse spreads a red colored light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned. (Use π= 3.14)

NCERT Solutions for Class 10 Science Chapter 12 Important NCERT Questions Areas Related To Circles Class, NCERT Books for Session 2022-2023 CBSE Board and UP Board Others state Board EXERCISE 12.2 Page No:231 Questions No:12

Shiv Ahuja

Asked: October 28, 2020In: Class 9

Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-163 Questions No-3

Bhumi Srivastava

Asked: October 28, 2020In: Class 9

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

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-175 Questions No-20

Bhumi Srivastava

Asked: October 28, 2020In: Class 9

Explain how defects in a metal block can be detected using ultrasound.

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-175 Questions No-21

Shiv Ahuja

Asked: October 28, 2020In: Class 9

How does the sound produced by a vibrating object in a medium reach your ear?

NCERT Solutions for Class 9 Science Chapter 12 Important NCERT Questions Sound NCERT Books for Session 2022-2023 CBSE Board and UP Board Intext Questions Page No-162 Questions No-1

Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sound in water if the distance of the object from the submarine is 3625 m.

Explain how defects in a metal block can be detected using ultrasound.

How does the sound produced by a vibrating object in a medium reach your ear?

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