Light and sound travel in waves. They are parts of
the electromagnetic and sound spectra.
will remember from science class, wave-speed is
equal to wavelength multiplied by frequency. White
light, or common everyday light, is made up of a
mixture of all the colors in the visible spectrum,
from red to violet. Therefore, the wavelength of
white light(in a vacuum) ranges from 390-780
nanometers (or 10^-9 meters!).
of this light ranges from 769 to 384 terahertz
(ask your teacher about the units of frequency).
Depending on the color, the wavelength and
frequency change. However, when you multiply one
wavelength by its corresponding frequency, you
will always end up with the same number: 3*10^8
The speed of sound is calculated
the same way. The frequency of audible sound
ranges from around 50 to 15*10^3 Hz (this varies
with different tones, like a tweeter or a woofer.
The range of wavelengths is6.9 m to 2.3 cm. If we
multiply these together, we get the same
answer,regardless of the tone! We get 344
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