Question

Part A. Two cello strings, with the same tension and length, are played simultaneously. Their fundamental frequencies produce audible beats with a frequency of 8 Hz. The string with the lower pitch (frequency) is tuned to an “A” (a frequency of 220 Hz). What is the approximate ratio of the linear mass density μ of the string with the higher pitch to that of the string with the lower pitch? (a) 0.93 (b) 0.97 (c) 1.02 (d) 1.04 (e) 1.06

Part B. What is the approximate minimum diameter of an objective lens required to resolve two bacteria lying 10−5 m apart on a glass slide placed 10 cm below an objective lens if they are being illuminated with green light λ = 5.3 × 10−7 m)? (a) 1 mm (b) 5 mm (c) 20 mm (d) 50 mm (e) 100 mm

Answer 1

A) 0.93

B) 50mm

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