The best filter to remove the K? x-rays from a Mo x-ray tube that have a wavelength of 0.06322 nm but that transmits the K? x-rays of wavelength 0.0711 nm is
(a) Nb with a K edge of 0.06529 nm
(b) Mo with a K edge of 0.06198 nm
(c) Y with a K edge of 0.07276 nm
(d) Ru with a K edge of 0.05605 nm
(a) Nb with a K edge of 0.06529 nm
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The apparent visual magnitude of a star is 7.3 . This tells us that the star is
a. one of the brighter stars in the sky. b. bright enough that it would be visible even during the day. c. not visible with the unaided eye. d. very far from Earth. e. very close to Earth.
When oxygen and hydrogen gases combine, the result is
A) water. B) methane. C) a noble gas.
A race car circles 10 times around a circular 8.0-km track in 20 min. Using SI units
(a) what is its average speed for the ten laps? (b) what is its average velocity for the ten laps? What will be an ideal response?
How did Mr. Hubble calculate the age of the universe?
A) by measuring the rate of expansion of the universe B) by looking at the age of the oldest stars C) by measuring the redshift of stars within 360 degrees of the center of our galaxy D) by measuring the rate of radioactive decay within the farthest galaxies