Answer in 3-5 sentences. 1. Relate the frequency of peak spectral power density of stars to their visible colors. 2. Demonstrate or describe Wein’s Displacement Law numerically and graphically
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- 1. Consider the following signal: x (t) = cos 2000лt + 2 соs 4000лt. What would this signal look like on a spectrum analyzer. Be sure to indicate relative magnitudes and frequencies. Describe the spectrum in words, e.g., "spikes at ..." If this signal were multiplied by a 1 MHz sine wave, find the spectrum of the product. (Describe in words.)The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is greater than its laboratory value of 656.3 nm, one can conclude that ... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. O C. The separation between Earth and the star is unchanging D. No conclusion is possible.a) The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in your calculation. Look up any required information about the star using Wikipedia. Use sensible approximations so your calculation is straightforward. For example you could consider only the region of the spectrum where the photon flux peaks. b) The Mid-Infrared Instrument (MIRI, camera and spectrograph) on the James Webb Space Telescope operates in the band 5 – 28 µm. For 58 Eridani, approximately how many photons per second can be used by this instrument? Assume that MIRI takes all the photons from the full JWST mirror. Show all steps in your calculation. Describe briefly two or three other factors which play a role in determining the sensitivity of an instrument such as MIRI?
- 1. What is the difference between spectral emission and absorption lines? And what is their origin? 2. What is one instance when Boltzmann’s constant appears?Choose the correct statements concerning the electromagnetic spectrum given off by stars. (Give ALL correct answers, i.e., B, AC, BCD...) A) Blue photons are more energetic than red photons. B) A hot star will be more red in color than a cooler star. C) All stars are the same color as our Sun. D) Hot stars are much brighter than cool stars of the same size and distance from the Earth. E) If we see a blue star and a red star in a nearby star cluster, we know the red star is hotter. F) Blue photons (blue light) have a longer wavelength than red photons.Briefly explain why the intensities of rotational spectral lines increase with increasing J and pass through a maximum before tailing off as J becomes large.
- The spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is less than its laboratory value of 656.3 nm, one can conclude that... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. C. The separation between Earth and the star is unchanging D. No conclusion is possible.Calculate the value for the KB x-ray wavelength for molybdenum (Z=42) in meters. Moseley's law is in the attached image, and use 1.097E-7 m for Rydberg's -1 constant R. Enter the result in scientific notation, eg. if the value is 6371.0 km use 6.3710E+6 for an answer in meters. 1 λK Type your numeric answer and submit R(Z - 1)² 1² (1/2-1/2) n² Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimal e.g. 2.5E5 for 2.5 x 10³)Choose the correct statements concerning the elec- tromagnetic spectrum given off by stars. (Give ALL correct answers, i.e., B, AC, BCD...)A) If we see a blue star and a red star in a nearby star cluster, we know the red star is hotter.B) Blue photons are more energetic than red photons.C) Hot stars are much brighter than cool stars of the same size and distance from the Earth.D) Blue photons (blue light) have a longer wavelength than red photons.E) A hot star will be more red in color than a cooler star. F) All stars are the same color as our Sun.
- Analyze the multi-wavelength images below and answer the few questions that follows up : 1. Where do you see the higher energy phenomena? What are they? Are they visible in any image? Why?2. Where are the young stars? What colour do they have? Are they visible in any image? Why?3. Where are the old stars? What colour do they have? Are they visible in any image? Why?1. Summarize your observations in three separate tables, as shown in the lab manual 2. Is there a difference between the stopping potential for the different intensities of light? 3. On the same graph, plot the stopping potential versus frequency for all intensities as a scatter plot. Use different symbols for each intensity and indicate the intensity (either aperture size or % transmission) on the graph legend. 4. Fit a straight regression line on the data. 5. Calculate the following 1. work function for the photodiode, 2. Plank's constant, 3. Threshold frequency of the photoelectric effect for this photodiode 6. What id photoelectric effect 7. Summarize three fundamental differences of the classical and quantum models of light, regarding photoelectric effect 8. Define the following concept with regards to light or photons (distinguished between the classical and quantum model of light or photons where applicable) 1. Intensity 2. Frequency 3. Energy 4. Coherent light source 5.…A)The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in calculation . B) The Mid-infared Instrument (MIRI , camera and spectrograph ) on the James Webb Space Telescope operates in the band 5-28 µm . For 58 Eridani , approximatley how many photons per second can be used by this instrument ? Assume that MIRI takes all the photons from the full JWST mirror . Show all steps in calcultation . Describe breifly two or three other factors which play a role in determining the sensetivitu of an instrument such as MIRI ?