4. [-/21 Points] DETAILS MY NOTES A transverse wave is observed to be moving along a lengthy rope. Adjacent crests are positioned 0.450 m apart. Exactly 8 crests are observed to move past a given point along the medium in 9.30 seconds. Determine the wavelength, the frequency and the speed of these waves. (a) Wavelength is Crest Crest Crest (b) Frequency is (c) Speed is9. [7/12 Points] DETAILS PREVIOUS ANSWERS MY NOTES Blue-green light has a frequency of about 6.6 x 1014 Hz . Using 3.0 x 10" m/s for the speed of light and using the relationship v = f / find the wavelength of this light in air. Wavelength (1) is 454.5 nm How does this wavelength compare with the size of an atom, which is about 10-10 m? wavelength = 4.54E17 X atom size 10-10 m Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. times the size of an atom. Comparing to the size of an atom is important because usually, you need a wavelength smaller than an object to be able to detect or image the object. 10. [7/13 Points] DETAILS PREVIOUS ANSWERS MY NOTES A certain radar installation used to track airplanes transmits electromagnetic radiation of wavelength 4.5 cm. (a) What is the frequency of this radiation, measured in billions of hertz (GHz)? 6.67 GHz (b) What is the time required for a pulse of radar waves to reach an airplane 5.1 km away and return? 1.5E-6 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. s4. [21I28Pointsl l DETAILS l PREVIOUSANSWERS l I MY NOTES A type of foam ear plug has a 35 dB overall EPA noise reduction rating. Sally wants to sleep on her bus ride and decides to use these earplugs. The noise level inside the bus is 85 dB. (A) What noise level would she perneive with the earplugs that have the 35 dB noise reduction? The reduced noise level would be 51 q dB. (B) A loud rock band produces a sound level of 115 dB at a location near the hand. In a work environment, regulations limit exposure to this vet}.r loud sound to 30 minutes or less per day. What is the sound intensity of the rock band? Intensity is 99 Win12. (C) Using the ear plugs with 35 dB noise reduction. what sound level would. she preceive? She would preceive an if dB sound level. (D) What is the sound intensity she hears with the ear plugs? Sound intensity, after attenuation by ear plugs, is \\:| x Your response differs from the correct answer by more than 100%. Wim2 8. [0/17 Points] DETAILS PREVIOUS ANSWERS MY NOTES (a) What is the intensity in W/m of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 480 J of energy into a circular spot 3.00 mm in diameter in 4.00 s? (90% of the laser output, the fraction absorbed, provides the intensity on the spot, so the laser must output a higher intensity to compensate for the light not absorbed.) X Your response differs from the correct answer by more than 10%. Double check your calculations. W/m (b) Compare this intensity to the average intensity of sunlight (about 1 kW/m-). (intensity of laser / avg intensity of sunlight) = X Your response differs from the correct answer by more than 10%. Double check your calculations. Submit Answer4. [10/22 Points] DETAILS PREVIOUS ANSWERS MY NOTES PRACTICE ANOTHER Burns produced by steam at 100"C are much more severe than those produced by the same mass of 100*C water. To verify this we will calculate the heat released by water at 100"C and steam at 100*C. (a) Calculate the heat that must be removed from 5.00 g of 100"C water to lower its temperature to 50.0*C. 0.25 kcal (b) Calculate the heat that must be removed from 5.00 g of 100"C steam to condense it and lower its temperature to 50.0-C. |2.93 kcal Using these amounts of energy released by the cooling, we can calculate the mass of flesh that would be heated to 50.0"C. (c) Calculate the mass of human flesh that the heat produced in each case can raise from the normal 37.0 C to 50.0"C. (Flesh is badly damaged at 50.0*C.) mass damaged by steam: X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. kg mass damaged by water: X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation, Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. kg The specific heat capacity of flesh is 829 cal/(kg *C) The specific heat capacity of water is 1000 cal/(kg *C) The specific heat capacity of steam is 480 cal/(kg *C) The latent heat of vaporization for H20 (steam - water) is 539 kcal/kg 5. [0/8 Points] DETAILS PREVIOUS ANSWERS MY NOTES The gauge pressure in your car tires is 2.00 x 10" N/mat a temperature of 35.0"C when you drive it onto a ferry boat to Alaska. What is their gauge pressure later, when their temperature has dropped to -40.0C? Assume that their volume has not changed. X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. The ideal gas law relates volume, absolute temperature (K not "C), and absolute pressure (not gauge pressure). atm (Use 1.013 x 10 Pa as 1 atm and -273.15'C as absolute zero temperature. Also assume that the air in the tire acts like an ideal gas. 1 N/m = 1 Pa) Submit