Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 9 Answered

1.TWO ASTRONAUTS CANNOT HEAR EACHOTHER ON THE MOON. WHY? 2.WITH THE HELP OF THE DIAGRAM PLZZ EXPLAIN THE WORKING OF HUMAN EAR? 3.THE SOUND OF A EXPLOSION ON THE SURFACE OF LAKE IS HEARD BY A BOATMAN 100m AWAY AND A DIVER 100m BELOW THE POINT OF EXPLOSION. i)who will hear sound first boatman or diver? why?
Asked by Piyush Nema | 26 Feb, 2011, 02:35: AM
answered-by-expert Expert Answer
Dear student
Pls. post each query individually.
Two astronauts cannot hear each other on moon because there is no atmosphere to reflect sound waves on moon.
Hope this helps.
Regards
Team
Topperlearning
Answered by | 26 Feb, 2011, 09:46: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 9 - Physics
(3 X 3 = 9) CASE STUDY QUESTION 26. Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components that are generally used in construction of big structures like buildings, machines and also scientific equipment. The cracks or holes inside metal blocks, which are invisible from outside, reduce the strength of the structure. Ultrasonic waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of flaw or defect. Clearly indicated in the figure Defect or flaw Ultrasound Detectors Metal Block (a) The transmitter sends an ultrasound wave of speed 5960m/s through a long steel bridge and a block reflects it back after 0.02s. how far the block in the metal bridge is from the transmitter. (b) With the above property of ultrasound waves, Can ultrasonic waves be used in the medical field? If so, how and give one use in the medical field to justify your answer? (c) Give two practical applications of reflection of sound waves?
Asked by mailtoparvathyprajith | 31 Jan, 2024, 06:55: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
What is the SI Unit of "Intensity of Sound"?
Asked by manaskumarbiswasbrb | 04 Feb, 2023, 08:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
explain human ear with lable diagram
Asked by sm6878261 | 12 Jan, 2023, 07:42: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
MCQ on reflection of light and sound chapter  
Asked by pooja12366764 | 25 Jan, 2022, 10:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
propagation of sound
Asked by ashishyadav | 22 Mar, 2021, 05:20: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
What is sound   
Asked by Alamglassfebricartion | 16 Mar, 2021, 09:57: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
A stone
question image
Asked by satyamthakur7570 | 21 Dec, 2020, 09:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
what is reverabation
Asked by mursaleenmalik1962 | 14 Dec, 2020, 07:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
Can blackbox pings signal travel 3000kms? Can it be reflected on metal surface?
Asked by dwarakanathan.s | 19 Apr, 2020, 07:02: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
what is tuning fork 
Asked by upmasoodpassi | 05 Apr, 2020, 11:09: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×