Answer:

Explanation:
R = Rydberg constant = 
= Principal quantum number of an energy level = 2
= Principal quantum number of an energy level for the atomic electron transition = 4
Wavelength is given by the Rydberg formula

The wavelength of the light emitted is
.
D. Electron cloud allowed the particles to pass through
Answer: plastic, wood, rubber
Explanation:

a)



b)


Using the atomic mass given in the periodic table:




c)


Using the atomic mass given in the periodic table:




This result is an aproximation.
Salad is biotic, it is made from plants and plants are alive.
biotic means alive
abiotic means not alive