As the harmonic numbers get larger, the wavelengths get smaller and the frequencies:
a. do not change.
b. sometimes get larger and sometimes get smaller.
c. get larger.
d. stay the same.
e. get smaller.
c
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In 1983 the standard meter was redefined to what it is currently. What was the previous definition from 1960 based on?
a. specific alloy bar housed at Sevres, France b. wavelength of light emitted by certain krypton atoms c. distance from the Earth's equator to the North Pole d. the distance light travels in a certain fraction of a second
Which of the following is not one of the spread sheets used by the NRC?
Cholesterol belongs to what class of organic compounds?
a. Alkyl halides b. Esters c. Carboxylic acids d. Alcohols
Suppose there is a cloud containing interstellar dust between a star and us. How will the dust affect the light we see from the star?
A) It makes the star appear dimmer and redder in color. B) It makes the star appear dimmer and bluer in color. C) It does not affect the star's brightness but makes it appear redder in color. D) It makes the star appear dimmer but does not affect the star's color.