Bootstrapping (statistics) In univariate problems, it is usually acceptable to resample the individual observations with replacement (case resampling below). In small samples, a parametric bootstrap approach might be preferred. For other problems, a smooth bootstrap will likely be preferred.
Below is a picture of a sound wave that has. been changed into alternating current by a microphone. and displayed on a CRO. If the sound is made louder and with a higher pitch, the shape of the wave changes as shown below. The amplitude has got bigger because the sound is louder. The frequency has increased. (there are more complete waves in the same time) because the sound has a higher pitch.
If you pass light through glass, its speed decreases and its frequency remains constant. This means the wavelength must decrease while the frequency stays the same. With waves it tends to be frequency that is constant. You need to think more about how, in this case, wavelength varies with speed.(Original post by muh123). I need a proper explanation to why it happens, I just don't understand why.t doesn't. Apart from light in a vacuum, the speed of a wave in a medium will vary with frequency or wavelength. It's called dispersion. Apart from light in glass, which is well known, the speed of sound in gases in some cases will increase with frequency. At higher frequencies in CO2 for example.