Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.


primary 6 | Maths | Percentage
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question

primary 6 chevron_right Maths chevron_right Percentage chevron_right Singapore


Date Posted: 3 months ago
Views: 29
Eric Nicholas K
Eric Nicholas K
3 months ago
It’s something to do with blocking. Imagine the sun shining at you. If something moves to block you, the sun will not be shining at you, correct?

Same idea. At the point where the ball passes the hole, there is no light detected since the ball is the one receiving the light.

At first, the intensity is more than zero. When the ball passes through, the graph goes down to zero. Once the ball passes through and there is no blockade, the graph goes back up again. This process repeats itself again.

There are four occurrences of the graph going down to zero, hence the ball passes four times.

Some horizontal lines at zero are longer than the rest. This shows that the balls travel at different speeds. Longer lines come about because the ball passes the hole more slowly (and hence, more time is needed to pass the hole, explaining the longer length).

See 1 Answer

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Irah Athirah
Irah Athirah's answer
48 answers (A Helpful Person)
Actually Tishar, I'm not so of an expert for Science but this is the best answer I can give. If you get it wrong, I can advice you to listen to your teacher's explanation and ask your teacher why is it being measured in this way. From there, you can actually learn something and apply this for your PSLE since this kind of qns frequently appear in exam papers. Hope this helps, and forgive me once again.