Ask a Doubt
Request a call back

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

CBSE Class 9 Answered

(i) Draw a well labelled diagram of human ear. (ii) What makes the eardrum vibrate? (iii) What is the audible range of average human ear?
Asked by Topperlearning User | 20 May, 2015, 02:06: PM
answered-by-expert Expert Answer

(i) Human ear

(ii) Eardrum moves inwards when compression reaches it and moves outwards when rarefaction reaches it, thus the ear drum vibrates.

(ii) Audible range - 20Hz to 20,000 Hz

Answered by | 20 May, 2015, 04:06: PM

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
explain human ear with lable diagram
Asked by sm6878261 | 12 Jan, 2023, 07:42: AM
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
Sound creates vibrations in our ear. We listen sound and understand it. But after this in which form of energy does it gets converted into? 
Asked by Vishalgarg1234 | 29 Nov, 2018, 07:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
Why do animals like dogs etc get uneasy before earthquakes?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
How does a hearing aid work?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
How is ultrasound used in various industries?
Asked by Topperlearning User | 31 Mar, 2014, 07:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
Which part of the ear contains the actual hearing organ?
Asked by Topperlearning User | 20 May, 2015, 01:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
What causes temporary deafness in high altitude flying aircrafts?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 9 - Physics
Draw labelled diagram of auditory parts of human ear and explain how the human ear works.
Asked by Topperlearning User | 20 May, 2015, 02:03: PM
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
×