The light intensity (2.80418x10^2) cm from a point source is (1.28990x10^0) kW/m². What is the intensity (2.791x10^2) m away from the same source? Express your result with four significant figures in W/m². Note: Your answer is assumed to be reduced to the highest power possible.
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- The light intensity (1.006x10^2) cm from a point source is (1.4794x10^0) kW/m². What is the intensity (3.73221x10^2) m away from the same source? Express your result with four significant figures in W/m2.Item 9 Learning Goal: To learn the properties of logarithms and how to manipulate them when solving sound problems. The intensity of sound is the power of the sound waves divided by the area on which they are incident. Intensity is measured in watts per square meter, or W/m². The human ear can detect a remarkable range of sound intensities. The quietest sound that we can hear has an intensity of 10-¹2 W/m², and we begin to feel pain when the intensity reaches 1 W/m². Since the intensities that matter to people in everyday life cover a range of 12 orders of magnitude, intensities are usually converted to a logarithmic scale called the sound intensity level 3, which is measured in decibels (dB). For a given sound intensity I, B is found from the equation ß = (10 dB) log (1). where Io = 1.0 × 10-¹2 W/m². Part A What is the value of log(1,000,000)? Express your answer as an integer. ► View Available Hint(s) The logarithm of x, written log(x), tells you the power to which you would raise 10…Radio waves travel at the speed of light, c = 3.00 x 108 m/s. Find the wavelength of radio waves (in m) that have a frequency of 486 kHz.
- Microwaves travel at the speed of light, 3.00 ✕ 108 m/s. When the frequency of microwaves is 7.00 ✕ 109 Hz, what is their wavelength? mYou place your ear onto a steel railroad track and hear the sound of a distant train through the rails Δt = 3.6 seconds faster than you do through the air. The speed of sound in steel is vs = 6100 m/s while in air the speed of sound is va = 343 m/s. (a) Write an equation for the time it takes the sound to reach you through the air if the distance to the train is represented by D. (b) Write an equation for the time it takes the sound to reach you through the steel if the distance to the train is represented by D. (c) Use the difference in these two times to write an equation for the distance to the train. (d) For the given information find the distance to the train in meters.In a student lab exercise, the wavelength of a 40,571Hz ultrasound wave is measured to be 0.872cm. Find the air temperature. Answer in K Calculate to one decimal.
- Christian Huygens in the 1600’s invented the first clock which was small enough to fit in an ordinary room but much more accurate than the large tower clocks of his day. What was his big idea? Why does it work well on land but not at sea? (Ships would have to wait many years for an accurate on-board timepiece).Question 6 What is the magnitude of the displacement of the object depicted by Graph B? О 8 m O 4 m O Om O 16 m O 12 mOn a hot day in Houston, the temperature was recorded at 37.8 deg. C. Determine the values for the speed of sound at this temperature in each case. Use your results in the third equation to determine the percentage difference. V(Tc) 331+ 0.6T = = (331) (773) V(TK) = 1/2 V(TC) - V(TK) (V(Tc) – V(TK))/2| %Diff = |fe x100 x 2.10 % 0.05% 0.17% 2,51 %
- The light intensity (3.431x10^2) cm from a point source is (1.3730x10^0) kW/m². What is the intensity (2.32713x10^2) m away from the same source? Express your result with four significant figures in W/m². Note: Your answer is assumed to be reduced to the highest power possible.1. (a) What is the intensity in w/m of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 540 J of energy into a circular spot 2.2 mm in diameter in 1.5 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. w/m? (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure. The intensity of a laser is about damaging if they enter your eye. times that of the sun, so clearly lasers can be veryThe highest frequency that we can hear is about 20 kHz (2x 10^4Hz). a) Calculate the wavelength (m) associated with this frequency for sound that travels at 345 m/s. b) How long is this in feet? (Roundanswers to the nearest tenth.