When a flower petal is 4.0 cm in front of a converging lens, the inverted image is half the height of the petal. What is the focal length of this lens?
A) 1.3 cm
B) 2.0 cm
C) 4.0 cm
D) 5.3 cm
A
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Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different names. C) They have different numbers of electrons. D) They have different atomic mass numbers.
What conditions are necessary for a partial solar eclipse?
A) new moon on ecliptic, with us in the penumbral shadow B) full moon on equator, with us in the umbral shadow C) new moon at perigee D) full moon at apogee E) first or third quarter moon at a node
The distance between the ruled lines on a diffraction grating is 1,900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3° B) 4.3° C) 5.3° D) 6.3° E) 2.3°
If light takes 8 minutes to travel from the sun to Earth and over 4 hours to travel from the sun to the planet Neptune, what is the distance from the sun to Neptune?
a. 5 AU b. 30 AU c. 30 ly d. 5 ly e. 0.6 ly