A proton moves across the Earth's equator in a northwesterly direction. At this point the Earth's magnetic field has a direction due north and is parallel to the surface. What is the direction of the force acting on the proton at this instant?
a. toward the northeast
c. toward the northwest
b. into the Earth's surface
d. out of the Earth's surface
B
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The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?
a. 300 K b. 100 K c. 900,000,000 K d. 90,000 K e. 10,000 K
The image of our galaxy in radio emission from carbon monoxide maps the distribution of molecular clouds. Which of the following would give a similar picture of our galaxy?
A) visible light, which is closest to how the night sky appears from Earth B) 21-cm-line radio emission from atomic hydrogen C) X-rays from hot gas bubbles in the disk D) infrared emission from interstellar dust grains E) visible light, showing the edges of supernova bubbles
How are galaxies important to our existence?
A) Without galaxies, there could not have been a Big Bang. B) Without galaxies, the universe could not be expanding. C) Deep in their centers, galaxies created the elements from which we are made. D) Galaxies recycle material from one generation of stars to the next, and without this recycling, we could not exist.
Flatten a spherical meatball into a hamburger and you increase its
A) surface area. B) volume. C) both of these D) none of these