By what factor is the intensity of sound at a rock concert louder than that of a whisper when the two intensity levels are 120 dB and 20 dB respectively?
a. 1012
b. 108
c. 106
d. 1010
e. 1011
d
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Which of the following is true of the light emitted by the big bang gases?
A) It is detectable with infrared telescopes. B) It can no longer be used to detect the big bang. C) It is not detectable with radio telescopes. D) It can be seen with the unaided eye.
A top is set spinning so that the rotation is counterclockwise around its axis when viewed from above. When the top is placed on a level surface it happens that its axis of rotation is not quite vertical. Viewed from above, which way does the rotational axis of the top precess?
a. clockwise b. counterclockwise c. It's random, if it starts clockwise it will continue clockwise, and vice versa, i.e., a 50% chance either way. d. The direction depends on the little shove given to the axis when the top is placed on the surface. e. In the northern hemisphere it will be clockwise, in the southern hemisphere it will be counterclockwise.
In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 150 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point P when the angular distance of P is 10° relative to the central peak, and the wavelength is 500 nm? (Convert your result so the angle is between 0 and 360°.)
A. 145° B. 155° C. 165° D. 135° E. 95°
What is the approximate width of the region inside the black square?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.