Selina solutions

Selina solutions

Grade 7

Sound | Numericals

Question 1

Q1) A boy fires a gun and another boy at a distance of 1020m hears the sound of firing the gun 3s after seeing its smoke. Find the speed of sound.

  • Solution

  • Transcript

Solution:

Distance = 1020 m

Time taken = 3 seconds

Speed=\frac{Dis\tan ce\ travelled}{Time\ taken}=\frac{1020}{3}=340ms^{-1}

Please welcome, Billy doesn't know today. We're in question number 6 that is from these two angles, which will have the larger user estimate and then come from magic. So first of all, let's estimate which would be greater. And I think the second one would be greater. I don't know you think of yourself and think about which would be together. So let's now come from by measuring both of them. So first of all, I think that you all know how to use a Keep the good left on one of the nights. Read it. You keep it like this on top of this line. So and this like the black light should be on the vertex. So now you take the measure you measure it like this. So the measurement of this angle is 42 by fighting. So the first angle is to let me write it down is 42 Went five degree. Let's go to the second one. With the second one. Oh, yeah. So again, I will rotate. We will examine keep it on top of this one right now. Love that many descendants. So yes, so this angle comes out to be 56 140. How much is that? If we 6.45 now was our estimate correctly? Yes. Our estimate was directed at this angle is bigger than this. Thank you guys for watching. Please like the video and subscribe to the channel. Thank you so much

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subject-cta

Question 1

Q1) A boy fires a gun and another boy at a distance of 1020m hears the sound of firing the gun 3s after seeing its smoke. Find the speed of sound.

  • Solution

  • Transcript

Solution:

Distance = 1020 m

Time taken = 3 seconds

Speed=\frac{Dis\tan ce\ travelled}{Time\ taken}=\frac{1020}{3}=340ms^{-1}

Please welcome, Billy doesn't know today. We're in question number 6 that is from these two angles, which will have the larger user estimate and then come from magic. So first of all, let's estimate which would be greater. And I think the second one would be greater. I don't know you think of yourself and think about which would be together. So let's now come from by measuring both of them. So first of all, I think that you all know how to use a Keep the good left on one of the nights. Read it. You keep it like this on top of this line. So and this like the black light should be on the vertex. So now you take the measure you measure it like this. So the measurement of this angle is 42 by fighting. So the first angle is to let me write it down is 42 Went five degree. Let's go to the second one. With the second one. Oh, yeah. So again, I will rotate. We will examine keep it on top of this one right now. Love that many descendants. So yes, so this angle comes out to be 56 140. How much is that? If we 6.45 now was our estimate correctly? Yes. Our estimate was directed at this angle is bigger than this. Thank you guys for watching. Please like the video and subscribe to the channel. Thank you so much

Still have questions? Our expert teachers can help you out

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subject-cta
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