solution:
You need to find the frequency, and they have already given you the wavelength. And since you already know the speed of light, you can use formula (2) to answer this problem. Remember to convert the nano meters to meters because the speed of light is in meters. 

The periods inside the Periodic Table is B. a horizontal row, and is numbered 1 through 7
hope this helps
Answer:
mass and speed
Explanation:
the motion of an object depends on how fast it's travelling and also how much mass it has
answer:
i am pretty sure you use cross charges for this.
so i think it is the third choice.