Claims that appear to be pseudoscience should be
A. accepted if it is said to have scientific validity
B. tested experimentally
C. accepted if promoted by news media
D. all of the above
Ans: B. tested experimentally
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How do we learn the chemical composition of the interstellar medium?
A) We make an educated guess based on the Sun's composition. B) By studying spectra of interstellar gas clouds. C) We collect samples of gas and dust from interstellar space. D) We use computer simulations of the interstellar medium.
The Solar and Heliospheric Observatory (SOHO) is positioned:
A) in a geosynchronous orbit around the Earth. B) in near-Earth orbit. C) about 1.5 million kilometers from Earth at the L1 Lagrangian Point. D) on the far side of the Sun at the L3 Langrangian Point. E) on the far side of the Moon.
An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 10.0 cm in diameter. What is the magnification of the image?
a. -0.500 c. +0.172 b. -0.200 d. +0.143
A plot of the continuous spectra of five different stars is shown in the figure. Based on these spectra, which of the stars has the lowest temperature?
a. Star A
b. Star B
c. Star C
d. Star D
e. Star E