Answer:
Speed, 
Explanation:
It is given that,
A light wave is described by the following function as :
.....(1)
The general equation of wave is given by :
........(2)
On comparing equation (1) and (2)



Wavelength, 



Frequency, 
Let v is the speed of the light wave. It is given by :



So, the speed of the light wave is
. Hence, this is the required solution.
Answer:
The direction will be
and the distance 250.75km.
Explanation:
Let's say A is the displacement vector which represents the first 170km and B the one for the next 230km. Then the components of these vector will be:

The vector which point from the origin to the final position of the plane will be R=A+B. We sum components on <em>x </em>and <em>y </em>independetly (vector property):


If
is the direction of R then:
⇒
⇒
.
The distance will be given by the magnitud of the vector R:
⇒
.
If they lose an electron, that means they become more positive since an electron is negatively charged. So the answer is ‘positive’