What is a white dwarf?
A) a star that follows a period-luminosity relation
B) a type of star that produces energy by gravitational contraction
C) a main-sequence star of spectral type F, which tends to look white in color
D) the remains of a star that ran out of fuel for nuclear fusion
D
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In video 2 for Chapter 17, they show a block of glass with 2 reflections of light. Why are there two?
A. The light refracts as it goes through the block, and this makes a second reflection. B. Diffraction at the surface produces multiple images. C. There is a reflection from the front of the block and from the back of the block D. There is an additional reflection inside the camera lens.
Doubling the wavelength of a photon would ______________
a. reduce its energy to one-half b. double its energy c. triple its energy d. not change
Consider an open pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?
A) 4L, 2L, L B) 2L, L, L/2 C) 2L, L, 2L/3 D) 4L, 4L/3, 4L/5
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat absorbed by the ice as it warms to 0°C is __________
Fill in the blank(s) with correct word