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.
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- What is your measurement of speed of sound in air in m/s? The number should have three significant digits. Your Answer: Answer unitsItem 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…In a student lab exercise, the wavelength of a 42,251Hz ultrasound wave is measured to be 0.863cm. Find the air temperature. Answer in K Calculate to one decimal.
- The equation of a traveling wave is (x, t) = 0.02 cos(0.25x - 500t), where the units are SI. The velocity of the wave is O 0.13 km/s. O 4.0 m/s. O 0.50 km/s. O 2.0 km/s. O 10 m/s.An enormous thunderstorm covers Dallas-Ft. Worth. Your best friend Clark is a storm chaser and heads to the center of the storm to take some readings while you stay dry at home. While Clark is at the center of the storm, he sees and hears lightning strike a tree that is 185 m from where he is standing. You are 134 km from the tree. How long does it take for the sound to reach Clark? Assume the speed of sound is 343 m/s. How long does it take for the light to reach you?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.
- A student under water clicks two rocks together and makes a sound with a frequency of 639.0 Hz and a wavelength of 2.4 m. What is the speed of this underwater sound? m/s3. The VE3KBR transmitter near Tokyo broadcasts on a frequency of 146.940 MHz. The transmitter is broadcasting a test sound that is picked up by a nearby amateur radio. The test sound has a frequency of 1 kHz and a wavelength of 33 cm. a) What is the wavelength of the transmitter’s radio wave (in metres)? b) What is the speed of the sound wave that is coming out of the radio (in m/s)?The loudness, L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, dd, from the source of the sound.A person 14 feet from a jetski, it is 75 decibels loud.How loud is the jetski when the person is 46 feet away? Round your answer to the nearest hundredth.
- You place your ear onto a steel railroad track and hear the sound of a distant train through the rails Δt = 2.7 seconds before you do through the air. The speed of sound in steel is vs = 6100 m/s, and and the air temperature is 36° C. Find the distance, D, to the train in meters.Which is the wavelength of a wave that travels at a speed of 3.0 × 108 m/s and has a frequency of 1.5 × 1016 Hz?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.