In the straight-ahead direction (? = 0°) in Fraunhofer diffraction, which of the following is observed on the screen?
a. a minimum equal in width to the adjacent minima
b. a minimum double in width to the adjacent minima
c. a maximum equal in width to the adjacent maxima
d. a maximum double in width to the adjacent maxima
d
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Radioactivity Basics: When an unstable nucleus decays by emitting an alpha particle, the atomic number Z of the nucleus
A. increases by 4. B. increases by 2. C. decreases by 2. D. decreases by 4. E. remains unchanged.
An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
a. 0 b. nR ln (V2/V1) c. nR ln (T2/T1) d. kn ln (V2/V1) e. kn ln (T2/T1)
Polarizing sunglasses have the transmission axis oriented ______________
Fill in the blank(s) with correct word
Why is there a radioactive source in a smoke detector?
a. It makes the smoke particles radioactive. b. It ionizes the air. c. It powers the alarm when the battery wears out. d. none of the above