Solution to the Worksheet (Sound)

Here’s the solution to the worksheet (on Sound): worksheet – sound – solution

Do not download this file if you haven’t attempted the worksheet! 

Prepare for the next worksheet on Refraction of Light.

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27 thoughts on “Solution to the Worksheet (Sound)

  1. can u please explain the answer to the first part of the last question? how time is related to frequency…both the graphs look the same to me.

  2. i’m taking the liberty of asking u an “out of the topic” question… i hope u don’t mind.
    how does a cassette or a cd or dvd produce sound and images???

    • i am giving it a try….

      reversibility of light:if a beam of light is reflected back on itself,it will transverse the same path as it did before reversal….
      mathematically put-1n2=2n1

  3. I think what anjaney is trying to say here is that if a light follows a path of lets say A,B,C,D then if the same light beam is reflected then it will follow the same path in reverse, so that basically becomes D, C, B, A.

  4. my q’s and conclusion on -(pls let me know if I am wrong)
    light-1- the same reversibility thing?
    2-do we need to know the alternative method in the ‘experimental verification of laws of refraction and determination of refractive index of glass’?
    Sound-
    1- is intensity the energy carried by the sound wave ?
    2-speed of sound is the same in the same medium in the same temp. no matter of its frequency?
    3-more frequency=longer the sound travels ?
    4-we can calculate the d if we know the speed of sound in the medium and the time taken for the echo to reach our ears? (or any if we know the values of the remaining two)
    5-when we use sound waves to detect things in water through high frequency waves doesn’t it effect the animals in the water?
    6- for a bat or a dolphin is there any such instance when the sound ranging may not work or give wrong result like refraction of sound due to temp. of the medium?( if the frequency is more wont in bend away more)
    7- sonar- what if the sound is reflected of in some other directing ?
    8- how exactly does ultrasonography work? is it harmful?

  5. Mehak other living beings have differing audibility ranges.
    For humans, sounds having frequencies 0f 20,000 might be painful, whereas this might not affect sea creatures at all!
    (its not high frequency/ultrasonic for them. Might be perfectly normal.)

  6. Q7. If the sound wave is sent at a particular angle and the wave strikes the sea bed,the wave will obviously get reflected back at an angle….. i hope that is satisfying

    • Wat I meant was that if sound also gets reflected like light then is there a possibility that it gets reflected in some diff. Direction and if so how often can this happen in the case of a sonar.(does not have to be the sea bed)and so how does it effect the readings of the sonar .

  7. okay I will try to put it in less words .like light, sound also reflects of surfaces right! soo does it also change direction ?(question 1) .if this is true r there chances when the sound emitted by the sonar does not come back to the receiver? is this all possible or just imagination!.(hope this is good enough!)

  8. Mehak responding to your 4th question-
    Quite obviously!! in maths or physica when you know two quantities in an equation, obviously the third one can be calculated.. so, if you know d and t, v can be found and similarly if you know t and v, d can be found.

  9. questions on light-
    1-like any thing else light carries energy right -Q-in sunlight a rock get hot,and it only reflects the light does not let it pass through and say a window glass also reflects a part of it and lets the other part through so will the rock be hotter or the glass and y? does rock absorb more energy?(i think i know the answer but i am not sure )

  10. pk. please answer my questions i beg of you i know they are not all related to icse but i still want to know about these answers.and thats wat sahyadri teaches us right to question everything accept (some times) your parents and teachers

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