Explain why the majority of large modern telescopes are not refractors
What will be an ideal response?
Refracting telescopes suffer from chromatic aberration, which limits their usefulness, whereas reflecting telescopes do not have this problem. The primary lens of a refracting telescope is much more difficult to manufacture than a mirror of the same size, and is more expensive.
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In a cyanine dye molecule, one electron is free to move up and down along a linear chain of carbon atoms, but cannot pass the nitrogen atoms at each of the chain’s ends. Assume that the length of the chain does not change much as we increase the electron’s energy (within reasonable limits). Which of the idealized models in this chapter might best describe the electron in this situation?
A. The quanton in a box model B. The Bohr model C. The simple harmonic oscillator model
Which of the following statements is true of Sagittarius A*?
A) It is a powerful source of radio energy. B) It is the largest constellation in our sky. C) It is the smallest constellation in our sky. D) It has a mass of less than 2 million solar masses.
A dark cloud can be detected if it happens to block the light emitted by more distant stars
Indicate whether the statement is true or false
A section of DNA that corresponds to a particular protein is known as a
A) codon B) chromosome C) gene D) genome