Simple Nature - Light and Matter

n/A triangular pulse spreads out. As always, the velocity of a wave depends on the properties of the medium, in this case the st ...

Our final result for the speed of the pulses is v=w/t = √ 2 T μ . The remarkable feature of this result is that the velocity of ...

mathematical statement of the intuitive fact developed above, that the string accelerates so as to flatten out its curves. Befor ...

care, because the delay is the same for every sound. Bass, drums, and vocals all head outward from the stage at 340 m/s, regardl ...

o/A graph of pressure ver- sus time for a periodic sound wave, the vowel “ah.” p/A similar graph for a non- periodic wave, “sh.” ...

s/Wavelengths of linear and circular waves. An easy way to visualize this is in terms of a strip chart recorder, an obsolescing ...

t/Ultrasound, i.e., sound with frequencies higher than the range of human hearing, was used to make this image of a fetus. The r ...

w/The pattern of waves made by a point source moving to the right across the water. Note the shorter wavelength of the forward-e ...

a frequency that is lower than normal. The Doppler effect will also occur if the observer is moving but the source is stationary ...

x/The galaxy M100 in the constellation Coma Berenices. Under higher magnification, the milky clouds reveal themselves to be comp ...

z/How do astronomers know what mixture of wavelengths a star emitted originally, so that they can tell how much the Doppler shif ...

aa/Shock waves are cre- ated by the X-15 rocket plane, flying at 3.5 times the speed of sound. ab/This fighter jet has just acce ...

Theory of Relativity, he showed that light waves would have Doppler shifts that would exactly, not just approximately, depend on ...

a/A cross-sectional view of a human body, showing the vocal tract. b/Circular water waves are reflected from a boundary on the l ...

waves to be partly reflected at the boundary between them? Is it their density? Their chemical composition? Typically all that m ...

d/An uninverted reflection. The reflected pulse is reversed front to back, but is not upside-down. e/An inverted reflection. The ...

f/A pulse traveling through a highly absorptive medium. Absorption So far we have tacitly assumed that wave energy remains as wa ...

our intuitive expectation of strong absorption of sound in water is incorrect. Water is a very weak absorber of sound (viz. whal ...

g/1. A change in frequency without a change in wavelength would produce a discontinuity in the wave. 2. A simple change in wavel ...

h/A pulse being partially re- flected and partially transmitted at the boundary between two strings in which the wave speed is d ...