What is the chemical composition of quartz?
Quartz is silicon dioxide (SiO2).
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What elements do astronomers consider heavy elements?
A) all elements besides hydrogen and helium B) elements that are heavier than iron C) elements that are heavier than uranium D) elements that are heavier than hydrogen E) elements that are heavier than carbon
One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer. B) it can better focus X-ray images. C) its adaptive optics controls atmospheric blurring better. D) in orbit, it can operate close to its diffraction limit at visible wavelengths. E) it is larger than any Earth-based telescopes.
Most of the energy emitted by a pulsar _____
a. is carried away as a ‘pulsar wind' of high-speed atomic particles b. produces strong gravitational waves that radiate for several light years c. ionizes the supernova remnant around the pulsar d. is in the form of neutrinos e. is carried away by the high-energy beam emerging from the poles of the pulsar
A diffraction grating has 300 lines per mm. If light of wavelength 630 nm is sent through this grating, what is the highest order maximum that will appear?
A) 8 B) 2 C) 6 D) 5 E) 5.3