7i. If you were standing on a train station platform, and a colleague was standi

Question

7i. If you were standing on a train station platform, and a colleague was standi speed, singing and playing their guitar, would their voice sound more like Taylor Swift or Kanye West? in terms of the Doppler Effect. ing on a train coming at you at high Explairn ii. In the scenario described in part i. would there be a redshift or blueshiftin the electromagnctic spectrum? 8 i. ii. What element is formed during the primary sequence stage of stellar evolution? Which one of the following elements would you expect not to occur in a first-generation star: carbon, sodium, boron? iii. List the following elements in the order of abundance you would expect to find in a massive star from the cone to the outside: helium, silicon, hydrogen, iron, oxygen. 9. Why are elements with even atomic numbers more abundant than their neighbors with odd atomic numbers?

Explanation / Answer

7i)When wave energy like sound or radio waves travels from two objects, the wavelength can seem to be changed if one or both of them are moving. This is called the Doppler effect. A colleague will find a train coming to it with change in wavelength result increase or decrease in wavelength and two wavelength of guitar and train sound colloids .

ii)A blueshift is any decrease in wavelength, with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to asredshift.this shifts the color from the red end of the spectrum to the blue end.

8i) Stars are born out of the gravitational collapse of cool, dense molecular clouds. As the cloud collapses, it fragments into smaller regions, which themselves contract to form stellar cores. These protostars rotate faster and increase in temperature as they condense, and are surrounded by a protoplanetary disk out of which planets may later form.The temperature of the contracting protostar increases to the point where nuclear reactions begin. At this point, hydrogen is converted into helium in the core and the star is born onto the main sequence. For about 90% of its life, the star will continue to burn hydrogen into helium and will remain a main sequence star.

8ii) no carbon,no sodium and no boron only hydrogen and helium

iii)helium and hydrogen

9. element with an even atomic number (such as carbon: element 6) is more abundant than both elements with the adjacently smaller and larger odd atomic numbers (such as boron: element 5 and nitrogen: element 7, respectively for the carbon). This tendency of the abundance of the chemical elements was first reported by Giuseppe Oddo however, does not apply to the universe's most abundant, and simplest element from the periodic table of elements: hydrogen, with an atomic number of 1. This may be because, in its ionized form, a hydrogen atom becomes a single proton.

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