Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond?
A) They have a wavelength of two cycles per second.
B) They have a frequency of 4 hertz.
C) We can calculate the wavelength of the ripples from their frequency.
D) They have a frequency of 2 hertz.
Question 2
Every second, the Sun converts about 600 million tons of hydrogen into 596 million tons of helium. The remaining 4 million tons of mass is ________.
A) converted to an amount of energy equal to 4 million tons times the speed of light squared
B) reabsorbed as molecular hydrogen
C) ejected into space in a solar wind
D) ejected into space by solar flares
El Niño and areas of high marine primary production around the Galapagos Islands. Noti
lower surface of Arabidopsis thaliana leaf, showing a trichome
Lance-Leaf coreopsis
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