<u>Answer:</u> The wavelength of light is 
<u>Explanation:</u>
To calculate the wavelength of light, we use Rydberg's Equation:

Where,
= Wavelength of radiation
= Rydberg's Constant = 
= Final energy level = 3
= Initial energy level = 6
Putting the values in above equation, we get:

Hence, the wavelength of light is 
Answer:
Handpicking right?
It is a very simple and easy method of separation. It doesn't require any kind of equipment to proceed. It takes very less time when performed for small quantity of mixture. It doesn't require any kind of preparation
Yes, i believe that it can have a physical change but it is most likely chemical.
is used to test for the presence of starch. Starch turns into an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex. In the absence of starch, the brown color of the aqueous solution remains.
Answer:
P(B) = 0.45 atm
Explanation:
Given data:
Total pressure = 1.30 atm
Partial pressure of A = 0.85 atm
Pressure of B = ?
Solution:
Total pressure = P(A) + P(B)
P(B) = Total pressure - P(A)
P(B) = 1.30 atm - 0.85 atm
P(B) = 0.45 atm