Answer:
if u are talking about science this is the answer solid, liquid, or gas
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:
more friction is produced on a hard surface than on a smooth surface because it takes more force and strength to push something heavy on a rough surface
Explanation: