Experiment A: Atoms And Line Spectra

Question 0

What’s the symbol and unit for wavelength

Answer 0

“Lambda”

Meters

Question 1

How do discharge tubes work?

Answer 1

Atoms of gas are excited by the passage of an electrical current from an electrode at one end to another at the opposite end. As the atoms return to a lower state photons are emitted.

Question 2

What is the symbol and unit for frequency?

Answer 2

“v”

Hertz/ cycles per second

Question 3

The speed of light is:

Answer 3

2.998x10^8 m/s

Question 4

What is the value of plank’s constant and it’s symbol

Answer 4

“h”

6.626x10^-34 J(s)

Question 5

What is the symbol for nuclear charge?

Answer 5

Z

Question 6

What is the relationship between wavelength, frequency, and the speed of light?

Answer 6

Wavelength = speed of light/ frequency

Question 7

What is the equation(s) for the energy of a photon?

Answer 7

E(photon)= h/c= hc/wavelength

Question 8

What is the value of Avagadros number?

Answer 8

6.022x10^23

Question 9

List the colors of the visible wave spectrum in increasing order of wavelength.

Answer 9

Violet, blue, green, yellow, orange, red

Question 10

Energies available to the electron for hydrogen like atoms (1 e) are given by the equations:

Answer 10

En= -Z^2Rh/n^2
Rh= 2.178x10^-18 J
Z = 1 for hydrogen, 2 for helium, 3 for lithium

Question 11

The transition of an electron between two energetic levels is given by the equation (moving from level m to level n)

Answer 11

Delta E= -Z^2Rh{(1/n^2)-(1/m^2)}

Question 12

What does Rh stand for?

Answer 12

The ionization energy of hydrogen (2.178x10^-18 j)

Question 13

What is the alternate form of the equation for energy level change?

Answer 13

1/wavelength= -Z^2(Rh)’{(1/n^2)-(1/m^2)}

Rh’= 1.097x10^-2 nm^-1:

Question 14

What does a larger value of A indicate?

Answer 14

More of the incident light has been absorbed