Which of the following is the file extension for Google's bitmap image format?
A. .psd
B. .bmp
C. .jpg
D. .webp
Answer: D
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The field just outside the surface of a long conducting cylinder which has a 2.0-cm radius points radially outward and has a magnitude of 200 N/C. What is the charge density on the surface of the cylinder?
A. 2.7 nC/m2 B. 1.8 nC/m2 C. 3.5 nC/m2 D. 4.4 nC/m2 E. 0.90 nC/m2
Where did Thomson's model place electrons in the atom?
a. Studded throughout a positively-charged material. b. Rotating around a positively-charged core. c. Uniformly distributed in the atom. d. Clustered in the center of a positively-charged sphere. e. At the two magnetic poles of the atom.
A pipe open at both ends resonates at a fundamental frequency fopen. When one end is covered and the pipe is again made to resonate, the fundamental frequency is fclosed. Which of the following expressions describes how these two resonant frequencies compare?
1. fclosed = fopen 2. fclosed = 3/2 fopen 3. fclosed = 2fopen 4. fclosed = 1/2 fopen 5.none of these
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces. b. the sun is the source of all the radioactive nuclei on Earth. c. there must have been many more radioactive nuclei on Earth when life began. d. there must have been far fewer radioactive nuclei on Earth before life began. e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.