this post was submitted on 30 Dec 2024
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So what's the answer? and why?
It should be 8 Hz, but according to the question text, that would mean answer "A", while according to the labels next to the answer options, it would be "B", because they're inconsistent.
oh yeah that's awful... I just noticed they wrote out the answers inside the question
A Hz is just an inverse second ie 1/s or s^-1. A vibration is a unitless quantity. The queation has given us 20 vibrations in 2.5 seconds or 20/2.5 * 1/s = 20/2.5 Hz =8Hz.
If that corresponds to option A or option B who knows. But i would guess whoever made the test put the answers in in the order they are written without realising the testing software shuffles the options when askibg students. Hence the button with 8Hz or B is the correct answer.
oh thank you! That's interesting! What discipline would study this? physics?
I do engineering but physics covers simmillar shit. But this seems like a very entry level question so im guess highschool physics.
Or just math…
Frequency is measured in hertz (Hz), with 1 Hz meaning one cycle per second. A frequency of 8 Hz will complete 20 cycles in 2.5 sec.
Hertz is the repetition per second, to get it you simply divide the amount with the time.
This gives you 20 "swings" divided by 2.5 seconds, getting to 8hz, B.
The correct answer is probably photosynthesis but it's not even on there. I think that's the joke.