Most astronomers agree to interpret ________ Law to mean that the present day universe is expanding
Fill in the blank(s) with correct word
Hubble's
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To explain retrograde motion as well as changes in planetary brightness, Ptolemy's model used ________
Fill in the blank(s) with correct word
A total lunar eclipse is visible only from the path of totality
Indicate whether the statement is true or false
Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular distance between those two houses in the distance is 30 degrees. B) The angular distance between those two bright stars in the sky is about 2 meters. C) The angular size of the Sun is about the same as that of the Moon. D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
A single-crystal wafer of silicon is to be used as a substrate for the deposition of thin-metal films that could be affected by the substrate’s crystallographic orientation. However, the crystallographic orientation of this particular wafer is not known. The wafer is placed in an x-ray diffractometer with a copper x-ray tube with a K? x-ray line at 0.1542 nm, and an intense peak is measured at an angle of 29.46°. Silicon is FCC with a lattice parameter of 0.543 nm. What planes are parallel to the surface of this silicon crystal?
What will be an ideal response?