Organic molecules are:
A) living cells.
B) carbon-based.
C) silicon-based.
D) found only on Earth.
E) not found outside our solar system.
B
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The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing?
a. 
b. 
c. 
d. 
e. 
Examples of astronomical objects that can be considered standard candles (or bulbs) are....
A. type Ia supernova B. 21-cm radiation C. planetary nebulae D. Cepheid variable stars
The three colors that comprise the image on a TV screen are
A) red, blue, and yellow. B) red, blue, and green. C) yellow, blue, and green. D) magenta, cyan, and yellow. E) red, green, and yellow.
A helium-neon laser (l = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?
a. 1.81 × 10^-6 m b. 1.00 × 10^-5 m c. 1.00 × 10^-4 m d. 1.31 × 10^-6 m e. 6.76 × 10^-7 m