084 094 104 114 • Name:

  1. For the next few questions the instructor should have brought a thermometer. He will write some values on the board. Use those values for the questions below.
    1. _______°C What is the dry bulb temperature?
    2. _______°C What is the wet bulb temperature?
    3. _______% Use a table to determine the relative humidity.
    4. _______°C Use a table to determine the heat index (the perceived temperature).
    5. ______________ What is the risk level for exercise: low, moderate, or high?
  2. A RipStik was swizzled ("wiggled") across a poster paper. The sinusoidal swizzle wave can be seen in the diagram below along with the measurements.
    RipStik swizzle sine wave 10 cm distance = 180 cm time = 2.70 seconds
    1. _________ How many wavelengths are shown?
    2. λ = _________ _________ Calculate the wavelength λ of one wave in centimeters.
    3. a = _________ _________ Calculate the amplitude a.
    4. τ = _________ _________ Calculate the period τ.
    5. f = _________ _________ Calculate the RipStik swizzle wave frequency f.
    6. ѵwave = _________ _________ Use the wavelength λ and frequency f to calculate the velocity ѵwave of the RipStik swizzle wave.
  3. A clapper clapping in synch with the echo claps 40 times in ten seconds during laboratory nine. The distance to the building and back was 95 meters.
    1. τ = ________ _________ Based on this data, what is the period for the echo (the out-and-back time in seconds for one echo)?
    2. velocity ѵ = _________ _________ Based on this data, what is the speed of sound?
    3. percent error = _________ Given that the actual speed of sound that day was 350 m/s, what is the percentage error?
  4. _________ _________ A thunder clap is heard 5 seconds after the lightning. Use a sound speed of 350 meters per second to estimate the distance to the location of the lightning.
  5. _________ _________ For the laboratory seven data on the following graph, what is the experimental speed of sound?
    Speed of sound data background rectangle major grid lines axes x-axis and y-axis linear regression line Linear regression equation manually placed y = 318.76 x + 12.89 data points as circles text layers Speed of sound data Echo flight time versus distance time (s) distance (m) y-axis labels 0 14 28 43 57 71 85 99 114 128 142 x-axis labels 0.00 0.05 0.09 0.14 0.18 0.23 0.27 0.32 0.36 0.41 0.45
  6. List the seven colors of the Newtonian rainbow spectrum in order:

  7. Color systems
    1. List the primary colors of light:
    2. List the secondary colors of light:
    3. List the primary colors of crayons:
    4. List the secondary colors of crayons:
    5. Define Hue:
    6. Define Saturation:
    7. Define Luminosity:
    8. What is the name of the computer color system that uses color words such as red, crimson, cyan, antiquewhite?
  8. What is reflection?
  9. What is refraction?
  10. Plot the following data on the graph provided and draw a linear best fit line through the data points on the graph.
    Optical image depth

    Data

    image dist i (cm)object dist o (cm)
    00
    58
    1016
    1524
    2032
    2540
    background rectangle major grid lines axes text layers Depth of an object under glass image depth i (cm) object depth o (cm) y-axis labels 0 5 10 15 20 25 30 35 40 45 50 x-axis labels 0 10 20 30 40 50
    1. ______________ Calculate the slope of the linear best fit line. The slope is the experimental index of refraction for the material.
    2. ______________ __________ Use the equation of the best fit line above to predict the image depth for a coral head that is 200 cm underwater.
    3. ______________ The above material is reported to have a theoretic index of refraction of 1.5. What is the percentage error for the slope you calculated based against a theoretic value of 1.5?

slope m= (y2−y1) (x2−x1)
distance d = velocity ѵ * time t
period τ = 1 ÷ (frequency f )
velocity ѵ = wavelength λ * frequency f
period τ = 1 ÷ (frequency f )
velocity ѵ = wavelength λ * frequency f
percent error= (experimental value−expected value) (expected value)

Relative humidity from dry bulb and wet bulb depression

Web bulb depression in °C: Dry bulb minus the wet bulb
Dry bulb T in °C 0.5 1.0 2.0 2.5 3.0 3.5 4.0 5.0
2195%90%83%79%77%72% 67% 60%
2496%91%84%80%78%74% 69% 62%
2796%91%85%81%78%75% 71% 65%
28 96% 93% 85% 82% 78% 75% 72% 65%
29 96% 93% 88% 84% 80% 76% 73% 66%
30 96% 93% 88% 84% 81% 76% 73% 67%
3296%93%89%85%81%78% 74% 68%
3596%93%89%85%82%79% 75% 69%
3896%93%89%86%83%80% 76% 71%

Heat index

Dry bulb temperature in °C
Relative humidity 212427282930313235
60% 21242829.5 32 33 35 38 46
70%21252930.7 34 35 37 41 51
80%22263032.1 36 38 40 4558
90%22263133.7 39 41 43 5064
100%22273335.6 42 44 49 54 72

Heat risk for exercise

Effective temperature in °C:Risk level
Less than 32 °CLow risk: Safe to exercise with proper hydration
32 °C to 41 °CModerate risk: Heat cramps or heat exhaustion likely
Above 41 °CHigh risk: Heat stroke likely.