Recent content by oneamp

  1. O

    Having trouble with logical reasoning

    The subject seems inexact to me. For example: -- In each question below is given a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follows beyond...
  2. O

    Fork made sparks in a microwave

    I understand that the electromagnetic waves inside a microwave can induce a current (terminology?) on a metal object within it. What I don't understand is why, when my fork touched the interior casing of the microwave, it made a lot of sparks and an arc-welder like black mark on the wall. If...
  3. O

    Worried about taking Calc II (life story/rant/cry for help)

    Youtube: PatrickJMT, and google Paul's online math notes. These will save you.
  4. O

    Undergrad Exponential distribution question

    Thank you
  5. O

    Undergrad Standard deviation in exponential distribution

    Thank you very much
  6. O

    Undergrad Exponential distribution question

    Thank you
  7. O

    Undergrad Exponential distribution question

    Here's an example of what I'm talking about, from http://www.itl.nist.gov/div898/handbook/eda/section3/eda3668.htm. The probability in the top left graph actually goes above 1 for some values of X < 1. How is this even possible? Thank you
  8. O

    Undergrad Standard deviation in exponential distribution

    Thank you. What is the point of having 'standard distributions' with different probabilities for X contained therein? What is 'standard' about that?
  9. O

    Undergrad Exponential distribution question

    Hi. I notice that some values of X on the exponential distribution PDF have a value of around 1. I understand the integral ends up being one, since those values of X are less than 1. But P(X) at those points still gets to 1, or thereabouts. How does that make sense, that the probability of a...
  10. O

    Undergrad Standard deviation in exponential distribution

    Thank you. Additionally, is it true that the standard deviation for an exponential distribution is the same as the mean? Does this imply that the first standard deviation for an exponential distribution is, on either side of the mean 'u', 0 - u, and u - 2u? Thank you again
  11. O

    Undergrad EM Wave Reflection: Why Parabolic Reflectors Differ from Mirrors

    Thank you
  12. O

    Undergrad Standard deviation in exponential distribution

    What is the significance of the standard deviation (equal to the mean) in an exponential distribution? For example, as compared to the standard deviation in the normal distribution, which conforms to the '68-95-99.7' rule? thanks
  13. O

    Undergrad EM Wave Reflection: Why Parabolic Reflectors Differ from Mirrors

    Thank you. What is the name for this... 'reflective coefficient at a given frequency'?
  14. O

    Undergrad EM Wave Reflection: Why Parabolic Reflectors Differ from Mirrors

    I suppose my question is, if the dish is scattering light, why is it not scattering the microwaves used for communication?
  15. O

    Undergrad EM Wave Reflection: Why Parabolic Reflectors Differ from Mirrors

    Why do parabolic reflectors for microwaves (e.g. satellite TV) not reflect light like a mirror? Why do things like spoons, which are presumably conductive, reflect light? Thank you