67. An airplane (v = 710 m-s1, T = - 54 C°) when the time between seeing above observer and hearing is 9.7 sec, find the altitude. مرتضى غني علي
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- 2. Two astronauts are 1.20 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 346 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship? m.If a sample of blue light has a wavelength of 4 x 10-7 meters, then what is its frequency, assuming the speed of light is 3.00 x 108 meters/second?An observer at sea level does not hear an aircraft flying at 6000-m standard altitude until 15 s after it has passed over head. Estimate the aircraft speed in m/s.
- How far does light travel in one year? [This distance is know as a light-year (ly) and is used in measuring astronomical distances.]If the intensity of light is 6 x 10-2 watts/m? at a distance of 3 meters from the source, what is the intensity of the light at a distance of 9 meters from the source? 3.Visible light corresponds roughly to the range of wavelengths from 400 nm (violet) to 700 nm (red). 1 nm = 1 nanometer = 10-9 m. What is the frequency of visible light at a wavelength of 600 nm? f= Hz Enter your answer above using scientific notation with the format x.yzEq = x.yz x109. For example, 1.23 x 10-9 is entered as 1.23E-9. What is the wavelength of a visible light wave with a frequency of 4.64 x 10¹4 Hz? λ = nm