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Astronomy chp 3
| Question | Answer |
|---|---|
| Which of the following spectra will result from a hot tenuous gas? A. Dark absorption lines on a continuous emission spectrum B. Equally spaced bright emission lines C. Both A and B D. Emission lines characteristics of atoms in the gas | Emission lines charactericis of atoms in the gas |
| A star moving away from the Earth at high speed will show | Red shifted spectral lines |
| Star X has surface temperature of 6000 K, and appears yellow. Star Y appears red. What can we conclude about star Y? | It's surface temp is lower than 6000K |
| What is an atmospheric window? | A range of wavelengths of electromagnetic radiation which transmit through the Earth’s atmosphere |
| Which of the following can be determined from Wien’s law? | temperature of the surface of the sun |
| What determines the identity of a chemical element? | number of protons in the nucleus and the total charge in the nucleus |
| An ordinary light bulb (the so-called “incandescent”) emits light by heating a metal filament. What kind of spectrum do you expect to observe from the incandescent light bulb? | Continuous emission spectrum |
| What causes the colors observed in the common rainbow? A. blackbody emissions, line emission, line absorption or none of the above | none of the above |
| The Northern Lights (red, green and blue colors observed in the night sky) are an example of | Line emission spectrum from atmospheric gases |
| The red light emitted from a neon sign is a result of: (Hint: A neon light feels much cooler to the touch than red-hot charcoal) | Line emission from a tenuous gas |
| Star X has a surface temperature of 6000 K, and appears yellow. Star Y appears white. What can we conclude about star Y? | It’s surface temperature is higher than 6000 K. |
| T/F? A hot tenuous gas produces a line emission spectrum | true |
| T/F A hot solid produces a continous spectrum | True |
| The absorption and emission lines occur in wavelengths characteristic of each atom | true |
| T/F The composition of a solid can be determined by examining the continuous spectrum. | false |
| 17. Which of the following electromagnetic waves has a wavelength longer than 800 nanometers? | infrared |
| How do we know that the Sun contains hydrogen? | Because the Sun’s spectrum contains absorption lines that match the spectrum of hydrogen |
| What conclusion can we draw about the motion of a star that does not show any Doppler shift? | The star may be moving perpendicular to our line of sight |
| What happens when an electron in an atom absorbs a photon? | The electron moves to a higher energy level |
| The Alpha star in the constellation of Orion shifts its position on the celestial sphere by 0.03 arc seconds per year and the Beta star shifts by 0.001 arc seconds per year. Based on this observation, which of the following conclusions is justifiable? | The shifts in direction do not provide information on the speed along the line of sight, therefore we can not draw any conclusion on the shift of the spectral lines. |
| A gas emits a spectral line at 100 nm and another spectral line at 1000 nm. Which of the following statements regarding the origin of the two lines is correct? | The energy change producing the 100 nm line is 10 times larger than the change producing the 1000 nm line. |
| Wien’s law applies to the _______ spectrum. | continuous emission |
| The wavelength of red light is _____ than the wavelength of blue light. | about 1.5 longer |
| Blue light has a higher ___________ than red light. | frequency |
| Spectral lines shifted towards higher frequencies are called _____. | blue-shifted |
| The spectral lines of a star will appear ________ if the star is moving away from the Earth. | red-shifted |
| The ______ attraction holds the electron in orbit around the nucleus of the hydrogen atom | electrical |
| A photon of blue light has ____ energy than (as) a photon of red light | more |
| Which spectral region has the highest energy per photon of radiation? | ultraviolet |
| Which spectral region is absorbed most by the atmosphere? | ultraviolet |
| Which spectral region travels fastest through free space? | all travel the same speed |
| Which spectral region has the lowest energy per photon? | radio wave |
| A Spectrum of approaching star has which of the following properties? | blue shifted spectral lines |
| Which property is produced by a hot blackbody? | continuous spectrum |
| Which property is produced by a cool gas between star and observer? Which property is produced by a cool gas between star and observer? | absorption line |
| An electron that jumps from n=1 to n=2 has which of the following properties? | absorption line |
| An electron that jumps from n=3 to n=2 has which of the following properties? | emission line |
| A red produced by neon light has which of the following properties? | emission line |
| A yellow color of banana has which of the following properties? | reflection |
Created by:
edeboo