An FM radio station broadcasts at 96.7 MHz. What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 108 m/s)
What will be an ideal response?
3.1 m
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In which direction does the daily motion of the Moon occur in the sky, against the background stars, when viewed from the Earth?
a. toward the west b. toward the east c. toward the north celestial pole in the summer and the south celestial pole in the winter d. No predictable pattern can be discerned.
Suppose a particular star has a core that is undergoing several stages of fusion simultaneously, as shown in this diagram. Based on our understanding of stellar lives, the mass of this star is probably
A) greater than 8 times the mass of the Sun. B) about 2 times the mass of the Sun. C) about the same mass as the Sun. D) less than 0.1 times the mass of the Sun.
What is the mass of 25.0 mCi of 99Tcm which has a half-life of 6.00 h?
A. 4.74 ng B. 50.7 pg C. 1.05 ng D. 3.29 ng E. 25.0 mg
Which of the following best describes why we have seasons on Earth?
A) The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year. B) Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others. C) The tilt of Earth's axis causes the Northern Hemisphere to be closer to the Sun than the Southern Hemisphere in summer, and vice versa in winter. D) The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest.