Suppose a certain type of atom had just 5 different energy levels. How many different frequencies could be emitted by a gas composed of atoms of this type?
A) 10
B) 4
C) 25
D) 5
E) an infinite number
A
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Half the stars in the Milky Way Galaxy are members of a binary system, many of which are likely to support life on planets
a. True b. False Indicate whether the statement is true or false
Maxwell guessed that visible light was an electromagnetic wave because of its:
a. energy. c. wavelength. b. frequency. d. speed.
How do humans use their eyes to measure relative distance by parallax?
a. By continuously focusing our eyes on distant objects, we can determine distance. b. Since our eyes are separated, the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. c. Our eyes can measure the time it takes light to travel from an object and from this we get distance. d. By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.
A simple pendulum, 2.6 m in length, is released with a push when the support string is at an angle of 45.0° from the vertical. If the initial speed of the suspended mass is 1.25 m/s when at the release point, what is its speed at the bottom of the swing? (g = 9.8 m/s2)
a. 4.1 m/s b. 3.9 m/s c. 4.1 m/s d. 16 m/s e. 7.2 m/s