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

Physics & Space Science

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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

Physics & Space Science

From Earth, the Sun and Moon have about the same angular diameter

Indicate whether the statement is true or false

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A general name for an intrusive igneous rock formation is ______________

a. discordant b. dike c. concordant d. pluton

Physics & Space Science

How many elements have been identified?

a. 92 b. 104 c. 114 d. over 200 e. none of the above

Physics & Space Science