Which of the following material types absorb all wavelengths of photons?
(a) Metals
(b) Semiconductors
(c) Dielectrics
(d) Free atoms
(a) Metals
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In the context of the transitions in a hydrogen atom, the Lyman series lies in the infrared region
Indicate whether the statement is true or false
Energy and Mass: An electron-volt is the energy gained by an electron if it is accelerated through a potential difference of one volt. What is the equivalent to an electron-volt in kilograms? (c = 3.00 × 108 m/s, e = 1.60 × 10-19 C)
Fill in the blank(s) with the appropriate word(s).
What is the process of accretion?
A) the separation of materials in a protoplanet by density, with dense material in core B) growth of an object by the accumulation of matter C) the breakup of large objects by violent collisions with other similar-sized objects D) the period of time during which the Sun swept away all the excess material in the solar nebula E) the process by which the solar nebula became heated during its collapse
Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the inside diameter of the tube is 2
40 cm, what is the area of the poster expressed to the correct number of significant figures? (Assume the poster is just as long as the tube and does not overlap itself.) A) 202.8 cm2 B) 637.1 cm2 C) 203 cm2 D) 319 cm2 E) 637 cm2