MHS Chemistry
Light and Energy Worksheet

For ease of typing, I will write numbers in scientific notation using "n" for "x10-" and "p" for "x10+"
Planck's constant is therefore 6.63n34 and the speed of light is 3.0p8             Got it?
 

Table 1
 Constants & Relations
Table 2
 Colors, & Information
E = hn
c = ln
h = 6.63n34 J/Hz
c = 3.00p8 m/s
1 m = 102 cm = 109 nm
1 nm = 10-9 m
1 Hz = 1 wave/sec
DE = hn = -2.18n18 J é1 __
1ù
ënf2   ni2û
color
wavelength (l)
frequency (n)
 
[nm]
[p14 Hz]
UV
<400
>7.5
violet
400 to 420
7.5 to 7.1
blue
420 to 490
7.1 to 6.1
green
490 to 580
6.1 to 5.2
yellow
580 to 590
5.2 to 5.1
orange
590 to 650
5.1 to 4.6
red
650 to 700
4.6 to 4.3
IR
>700
<4.3

 

 

 

 

 

 

 

1. Fill in the blanks in the following table:
 
element
symbol
atomic #
p+
n0
e-
mass #
atomic weight
charge
 
C
    
8
6
      
Yttrium
        
36
86
    
Iron
      
31
23
      
   
35
  
45
      
1-
       
11
    
20.1797
0
 
H
    
2
1
      
Potassium
      
19
18
      
     
92
    
235
  
6+
   
9
      
19
  
1-

 2. Fill in the blanks in the following table:
 
particle
symbol
mass (amu)
charge
location
proton
p+
      
neutron
        
electron
        

 3. An electron [gains, loses] energy when it emits a photon of light.
 4. [Infrared, Visible, Ultraviolet] light has the highest frequency.
 5. [Infrared, Visible, Ultraviolet] light has the most energy.
 6. [Infrared, Visible, Ultraviolet] light has the highest wavelength.
 7. [Red, Violet] light has the higher frequency.
 8. [Red, Violet] light has the higher wavelength.
 9. [l, n] is the symbol for frequency, and [l, n] is the symbol for wavelength.

10. Fill in the blanks in the following table:
 
"floating point"
scientific notation
"silly"
 
4.21n3
--
12,900
  
--
   
451n9
0.0000834
  
--
659,000,000,000,000
  
--
 
3.0p8
--
 
0.006p5

11. Convert 522 nm to m.

12. Convert 4.44n7 m to nm.

13. What is the wavelength of a photon with frequency 5.7p14 Hz?  What color is it?

14. What is the frequency of a photon with wavelength 6.2n7 m?  What color is it?

15. What is the energy of a photon with frequency 7.3p14 Hz?  What color is it?

16. What is the energy of a photon with wavelength 600 nm?  What color is it?

17. What is the speed of a water wave with frequency 5 waves/min and wavelength 13 m?

18. What is the frequency of a photon with wavelength 565 nm?  What color is it?

19. What is the frequency of a photon with energy of 6.22n19 J?  What color is it?

20. What is the wavelength of a photon with energy 5.5n19 J?  What color is it?

21. How does the line emission spectrum of a pure sample of an element compare with
      its line absorption spectrum?

22. What is the energy of a photon produced by an electron moving from n=5 to n=2?


 
 

[Chapter 4 Notes][MHS Chem page]