Question
1. A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration?
a) 0.05 mm
b) 5.0 mm
c) 15.mm
d) 20.mm
e) 180 mm
my answer: I got 10 mm but it is not listed as an option
2. When a tuning fork of unknown frequency is sounded simultaneously with a 512 Hz tuning fork, 20 beats are heard in 4.0 seconds. What are the possible frequencies of the unknown tuning fork?
a) 0.05 mm
b) 5.0 mm
c) 15.mm
d) 20.mm
e) 180 mm
my answer: I got 10 mm but it is not listed as an option
2. When a tuning fork of unknown frequency is sounded simultaneously with a 512 Hz tuning fork, 20 beats are heard in 4.0 seconds. What are the possible frequencies of the unknown tuning fork?