64. We observe two stars, the first emits mostly red light and the second emits
ID: 2029701 • Letter: 6
Question
64. We observe two stars, the first emits mostly red light and the second emits mostly blue light. What can we say about the two stars? A. The first is closer than the second B. The first is larger than the second C. The first is brighter than the second D. The first is larger than the second E. The first is colder than the second 65. At the same temperature, the particles in which gas will move slowest? (Hint: Find these elements in the periodic table) A. Helium B. Argon C. Bororn D. Oxygen E. Hydrogen 66. Which of the following ideas did Albert Einstein take to build his theories of special relativity? A. Thermodynamics B. All motion is relative C. Mach's principle that far away objects do not influence nearby ones. D. Quantum theory E. Motion must be observed relative to the fixed reference frame of absolute spaceExplanation / Answer
Answer:
(64) Answer is option (E) the first is colder than the second.
Red color has less frequency when compared to blue color, so if frequency is less then the corresponing emitted energy is less compared to the second star, that means the first star is colder than the second star.
(65) Argon is the correct answer.
Because, the RMS velcity of the particles in a gas is Vrms = (3kT/M)1/2, from this we can say that Vrms is inversely proportional to the root square of M, where M is the molecular weight.
That means, for high molecular weight gas particles has less rms velocity compared to the low molecular weight gas particles. Out of the 5 gases, Argon (Ar) has molecular weight M is approximately equals to 40 amu. which is heighest than other gases.
(66) Correct answer is option (E), Motion must be observed relative to the fixed reference frame of absolute space.
Einstein introduced the concept of frame of reference.
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