JAMB - Physics (1984 - No. 14)
One of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?
260Hz
252Hz
248Hz
264Hz
258Hz
설명
- When a tuning fork is loaded with wax, the frequency of the tuning fork decreases, I.e when the prongs are loaded, their inertia increases, resulting in decrease of vibrational frequency.
Beat = F2 - F1
4 = 256 - F1
F1 = 252Hz