# Recent content by ecy5maa

1. ### Remote Internet voting security flaw?

Hi guys, Traditional voting via paper ballots at polling stations, meant that each individual was free to vote for his candidate in complete privacy. A father could vote for a separate candidate and a son for another candidate. So I was wondering is there any way in which to ensure similar...
2. ### Protocols insecure against Replay Attack

Homework Statement Determine which of the following protocols are insecure against replay attack , and explain why: (a) A → B : username, password (b) A → B : username, h(timestamp, password) (c) A → B : username, timestamp, h(password) (d) A → B : username...
3. ### Measuring the size of a molecule

Hi, Homework Statement I am trying to determine the size of a molecule..by doing the oil drop experiment where we drop a tiny droplet of oil on water covered with a thin layer of powder...and then make calculations based on the diameter of the circle... the droplet forms in oil. The Attempt...
4. ### Measuring speed of sound in air

The signal generator + loud speaker would produce audio waves. But right now the lab does not have a loud speaker. So ill have to make do without
5. ### Measuring speed of sound in air

Ok. Thanks never the less.
6. ### Measuring speed of sound in air

im stumped :confused:
7. ### Measuring speed of sound in air

ohh i thought u meant without using any microphone... So i place the mic a distance x from two people who themselves are a distance y between them. Then I ask them to both clap at the same time. and record the distance between the peaks shown on the Oscilloscope? However, I change x or do I...
8. ### Measuring speed of sound in air

Umm...but wont i still need something to catch the sound wave the 'claps' produce? :confused:
9. ### Measuring speed of sound in air

two people who clap at the same time?
10. ### Measuring speed of sound in air

which is ? :confused:
11. ### Measuring speed of sound in air

So what you are saying is; I connect the microphone to the pre amp. That will amplify the sound waves from the 'clap' and then i monitor the output from the scope? Hmm..i guess i can clap at increasing or decreasing distances from the mic ?
12. ### Measuring speed of sound in air

nope i didnt use the preamp. but how would i use the preamp just for a clap?
13. ### Measuring speed of sound in air

i tried a simple one by connecting two microphones to the oscilloscope keeping a distance x between them and clapping a distance y from both of them. But none of my claps, or any music that i played registered any wave fluctuation
14. ### Measuring speed of sound in air

Yes. The lab sheet just says we have to use a microphone and an oscilliscope. Everything else is dependent on the person doing the experiment
15. ### Measuring speed of sound in air

Hi. I have been given the task to measure the speed of sound in air. The materials available are: 1. Microphone 2. Signal Generator 3. Amplifier 4. Digital Oscilloscope I have looked through google and the simplest exp involves a loudspeaker as well. However I dont have one...