Phy107 Essay Example | Topics and Well Written Essays - 750 words

Phy107 - Essay ExampleA blackbody emits infrared wavelengths at room temperature. As the temperature increases, the blackbody mastermindts to emit microscopical lively, starting from red to orange, yellow to white and blue with increasing temperature. When the blackbody turns white, it is already emitting ultraviolet radiation.Stefans Law states that the total energy radiated by a blackbody per unit surface area is directly proportional to the fourth power of its absolute temperature. This means that as temperature increases, the wavelength of the radiation emitted decreases.Doppler Effect, or Doppler shift, happens when an observer is moving relational to the wave source - there is a change in the frequency of the wave descryd by the observer. This means that when we are approaching the wave source, we perceive a higher frequency. When we are receding from the wave source, we perceive a lower frequency.Spectroscopy refers to the dispersion of an objects light into its comp 1nt colors. By analyzing the light emitted by an object, the physical properties of that object such as temperature, mass, luminosity and composition can be inferred by an astronomer.Continuous spectrum, as opposed to discrete spectrum, refers to energy at all wavelengths. It is emitted by impassioned objects. The spectrum of light with missing frequencies is called absorption spectrum. ... Continuous spectrum, as opposed to discrete spectrum, refers to energy at all wavelengths. It is emitted by warm objects. The spectrum of light with missing frequencies is called absorption spectrum. The missing frequencies correspond to wavelengths of light that were absorbed.3. Explain how a beam of light passing through a diffuse smirch may give rise to both absorption and emission spectra.Suppose that a beam of light passes through a gas, some of the frequencies of the light leave behind be absorbed by the gas. The rest of the frequencies will be able to pass through. When these surviving fre quencies are dispersed through a prism, they will cross-file a spectrum with gaps on it. The visible spectrum will correspond to the emission spectrum while the dark bands will correspond to the absorption spectrum.4. List three properties of a star that can be determined from observations of its spectrum.a. Total energy that the star radiatesb. Luminosityc. Surface temperatureCHAPTER 51. List three advantages of reflecting telescopes over refractors.a. Refractors tend to be heavier boilers suit than reflecting telescopes because of their longer solid tubes and require a larger housing and a more massive mount.b. Reflectors dont disperse color as most refractors are to one degree or another.c. In a refractor the lens can only be supported along the edge so that the path is clear for light to come through unobstructed.2. How does Earths atmosphere affect what is seen through an optical telescopeThe Earths atmosphere is constantly moving, and different layers bend the light from a s tar in different directions, blurring our view from the ground.3. What are the advantages of a CCD over a photographThe major advantages of CCD-based cameras are