Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound in air is 340 m/s, what is the smallest size insect they can detect?
5.7 mm
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Four of the five answers below are correct statements about electrons. Select the exception
a. Electrons closest to the nucleus are at the lowest energy level. b. No more than two electrons can occupy a single orbital. c. Electrons cannot move out of their assigned orbital space. d. The innermost orbital holds two electrons. e. At the second energy level, there are four possible orbitals with a total of eight electrons.
If an object is accelerating, it must therefore undergo
A) a change in velocity. B) a change in direction. C) a change in speed.
What observations characterize solar maximum?
A) There are many sunspots visible on the surface of the Sun. B) The Sun rotates faster at its poles. C) The Sun becomes much brighter. D) The Sun emits light of longer average wavelength. E) all of the above
If a transformation from solid to liquid occurs such that the solid and liquid are always in equilibrium, than the transformation is _____________.
Fill in the blank(s) with the appropriate word(s).