Recent content by nobb

Hi. I am a bit confused with this question: A plane wave of 400-nm light is incident on a 25-µ(mu) m slit in a screen, as shown in the figure below. At what incident angle will the first null of the diffraction pattern be on a line perpendicular to the screen? (picture is attached). Do I...

Hi. How many grams of antifreeze must be dissolved in 300 g of water in order to reduce the freezing point of water to –13.02o C under 1 atm pressure (Kf: 1.86 o C/molal and C3H5(OH)3: 92.09 g/mol). I have not learned molality yet and I am completely confused as to where to start. I...

Hi. I am having trouble with acid-base titration excercises. 0.02 L butanoic acid @ 0.1 M is titrated with 0.01 L NaOH solution @ 0.1 M. The Ka of butanoic acid is 1.54X10^-5. Find the pH. The answer is 4.81. I know how to find the pH when no NaOH is added, but I really don't see how the...

Hi. I was wondering if someone could please explain how to do this question. Find the pH of 1 L buffer (1 mol/L CH3COOH, 1 mol/L CH3COO-) when 0.1 mL 1 mol/L HCl is added. Help would be appreciated. Thanks in advance.

Thanks for everyones help so far. I have found what I am looking for and I am pretty sure it'll work. I already know the natural frequency of the source and I am just trying to find the changing frequency.

Hi. I am doing a project about the Doppler Effect and I was wondering if someone here could help me. I have a tone source and I need to find the frequency with respect to time. I could use my mp3 player to record this frequency, which will then save it as a .wav file. I was wondering if...

Thanks for your reply with examples. However, I am still unsure of whether having a definitive answer will make a question more or less important. Right now, I am thinking that just because a question does not have a universally accepted answer, does not make it more or less important. I do...

Hi. This is my essay topic: Do questions like “why should I be moral?” or “Why shouldn’t I be selfish?” have definitive answers as do some questions in other Areas of Knowledge? Does having a definitive answer make a question more or less important? I realize that these questions regarding...

Thanks for your reply. Yes, that is my booster pack. I am using a solar panel because that is what is availiable to me (I do not have the original charger). Could I just charge the pack by running my car then hooking up the booster pack in parallel with the main car battery?

Hey. I am not too knowledgeable on this topic so I was wondering if some of the knowledgeable folk here could help me out. Anyways, I have a 12 volt vehicle booster pack which is pretty discharged. There are no ratings on it except for the label that says "ES 2500." I am guessing that the 2500...

I know I have to do some algebra to find some sort of ratio. My problem is that I have no idea where to start.

The identical lamps in the circuit (attachment) each have a resistance R at their rated voltage of 6V. The lamps are to be run in parallel with each other using a 12V source and a series resistor Z in the circuit as shown. If the lamps are to operate at their rated voltage, what must be the...

Thanks for all your suggestions, but my teacher just said that I must do something where I can obtain quantitative results, so basically all theories are cut. Any other suggestions?

Could you give me an example of easily explanable material on string theory? Maybe I could focus on a small area. I don't really have much knowledge of string theory at the moment. I've only watched Nova's The Elegant Universe, and I'm very interested.

Hey I am in high school and I have to write and extended essay (4000 words with sources) for the IB program. I was thinking about writing something about string theory. After watching The Elegant Universe, I was pretty interested. Would string theory be too hard for a high school student...