How wide must a narrow slit be if the first diffraction minimum occurs at ±12° with laser light of 633 nm?
a. 3.0 × 10^?6 m
b. 3.0 × 10^?5 m
c. 6.1 × 10^?6 m
d. 6 .1× 10?5 m
e. 1.5 × 10^?6 m
a
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In a laboratory accident a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and, after correcting for the background rate, obtain the data shown in the table
Time (days) 0 2 6 11 19 30 Counts/min 1000 899 727 557 364 202 The accident occurred at t = 0. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 133 counts per minute. Of the choices listed below, which one is the earliest time that workers could safely return? A) 38 days B) 44 days C) 50 days D) 32 days E) 24 days
From Earth, the Sun and Moon have about the same angular diameter
Indicate whether the statement is true or false
A general name for an intrusive igneous rock formation is ______________
a. discordant b. dike c. concordant d. pluton
How many elements have been identified?
a. 92 b. 104 c. 114 d. over 200 e. none of the above