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Old 01-01-1970, 12:00 AM
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From: <[Only registered users see links. ]>
Subject: I'm stuck with gr. 11 physics
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I'm struggling with this following question and any help will be greatl
appreciated
Two vibrating sources emit waves in the same medium. The first sourc
hasa frequency of 25 Hz, while the frequency of the second source is 7
Hz. Waves from the first source have a wavelength of 6.0 m. They reflec
from a barrier back into the original medium, with an angle of reflectio
of 25 degrees. Waves from the second source refract into a differen
medium with an angle of incidence of 35 degrees. The speed of th
refracted wave is observed to be 96 m/s
b) What is the speed of the waves from the second source in the origina
medium? Explain your answer
I don't feel enough info has been given to solve the question for all
have to work with is the frequency. The first source has the frquenc
and wavelength given so finding the speed would be a cinch. The speed i
given for the second source but only after it has been refracted into
different medium in which the speed and angle would have changed. I
there is a relationship between the angle of incidence and the angle o
refraction and the speeds at which the wavelengths propagate, which I kno
there must be, i do not know it. My book does not give any examples i
which angles are taken into account for the solving of velocity
frequency, and wavelength. Therefore, if there is a formula which does involv
the angles of incidence or refraction I'm probably not allowed to use it
'cause I'm not supposed to know it yet
Please help
--


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