1.2x107r 1.0x107 8.0x108 6.0x10 4.0x106 2.0×10 0 0 2x10-6 4x10-6 6x10-6 waveleng
ID: 296777 • Letter: 1
Question
1.2x107r 1.0x107 8.0x108 6.0x10 4.0x106 2.0×10 0 0 2x10-6 4x10-6 6x10-6 wavelength (meters) The graph above shows the spectrum from a hot glowing object 15 a) Estimate the wavelength at which this object gives off the most intense light 15 b) What part of the electromagnetic spectrum does this wavelength fall within? (radio? uiltraviolet? gamma ray?) 15 c) Estimate the temperature of the object giving off this spectrum. 16) In the morning, a man steps on a bathroom scale and finds that he weighs 200 pounds At noon we wave a magic wand and triple the mass of every object in the universe. If he steps on the scale before bed, how much will he weigh? 17) If the moon is rising at 3am, what phase is it in? 18) An asteroid is 3 72 AU from the Earth.How much time will it take its light to travel through space to reach us? 19) If it takes 25 seconds for radio signals from a space probe to reach us, what is its distance?Give your answer in AUExplanation / Answer
Answer 1: As we can see from the graph that at the wavelength of 2*10-6 to 2.5*10-6 meter the intensity(y-axis) is maximum.
Answer 2: most of the wavelength fall in 2000 to 6000 nm which belongs to the infrared region of em spectrum.
Answer 3: there is the relationship T=2898*10^-6/wavelength so if we assume the wavelength of 2*10^-6meter
the temperature will be= 1449 K
Answer 4: weight of the person is equal to mg where m is his own mass and g is gravity.
g=GM/r2 where M is mass of the other object which is attracting a person or the mass that we triple at the noon time.so g will increase by 3 times.
so our new g'= 3g. hence person weight increase by three times .
answer 5: Waning crescent.
answer 6: light travels 1 Au in 500 seconds(8 minutes,20 seconds) so the time taken by it to travel 3.72 Au is 1860 second or 31 minutes.
answer 7: speed of radio signal is same as of light since it is part of em spectrum. We know that light travel by speed of 500 seconds per Au so the distance in Au is 0.2 Au.
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