Atomic Structure Worksheet ---- Name: _________________________________ p: _____

Light travels through space by means of waves. Each wave has a frequency ( n ), a wavelength ( l ), and an amplitude. The figure below represents a light wave. Label the wavelength and amplitude. Then answer questions 1 - 4.


1. Given the distance scale in micrometers, mm ( 1.0 x 10-6 m ), shown in the figure, what is the wavelength in meters per wave?

 

2. Given that 6.0 x 108 crests of the wave pass a point in 1.0 microsecond ( 1.0 x 10-6 sec. ), what is the value of the frequency of this wave in waves/sec (or Hz).

 

3. Calculate the product of the answers to questions 1 and 2 above.

 

4. What is the significance of the value just calculated?

 

5. Fill in the missing information:

SYMBOL 

 ATOMIC NUMBER

ATOMIC MASS (amu) 

 NUMBER OF PROTONS

 NUMBER OF NEUTRONS

 NUMBER OF ELECTRONS

 CHARGE

 
            
 

 18

 40
      

 0
   

 127
  

 74
  

 -1

 
            
       

 26

 22

 0
   

 238

 92
    

 0

6. What is the energy of a quantum of light with a frequency of 6.17 x 1014 Hz?

 

7. Solar panels rely on light's ability to remove electrons from the surface of the solar cell. The energy required to release an electron from atoms on the surface of the cell is 6.7 x 10-19 J. What wavelength of light would be necessary for electrons to leave the cell's surface and return to the surface to produce the energy (used as electricity?)

 

8. A certain wavelength of blue light has a frequency of 6.91 x 1014 Hz. What is the wavelength of this blue light?

 

9. Find the average mass of Tungsten if the relative amounts are as follows:
Isotopic Mass: Percentage:
181.27 amu, 10.5 %
182.69 amu, 19.6 %
184.73 amu, 67.3 %
185.34 amu, 2.6 %