The distance between two successive crests of a wave is one way to define its wavelength, so
λ
=
1.15
m
.
The frequency of a wave is the number of waves passing a given point per second, so
f
=
20
16.2
=
1.23
Hz
.
The speed of a wave is given* as
v
=
λ
f
, so here
v
=
1.15
⋅
1.23
=
1.42
m/s
~~~~
*This is because the wavelength is the "distance per wave" and the frequency is the "number of waves per second," so multiplying the two gives "distance per second." This can be verified with dimensional analysis:
Because the temperature and the radiation are not correlated, they're not represented as functions of each other, they're represented as independent variables thus using graph 5 you cannot figure out how one affect another
