Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50 000 V than using red light (500 nm)?
a. 3
b. 4
c. 5
d. 6
e. 14
C
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For absorption spectra to exist
A) the light source must be a gas. B) partially absorbent material must exist between the light source and the spectroscope slit. C) the spectroscope must be equipped with an absorption cell. D) all of the above E) none of the above
If we photograph a person's face using dim light and an extremely short exposure time, the film will reveal
A) a spread out but very fuzzy image of the face. B) a very dim image of the face. C) only a few separated tiny spots that don't much resemble the face. D) only a few separated interference lines. E) only a single tiny spot right at the center.
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
a. 3.5 b. 49 c. 14 d. 43 e. 4.3
Supergiant stars are burning different fuels in several shells around the core
Indicate whether the statement is true or false