Two tuning forks are generating sounds of wavelengths 34.4 cm and 33.94 cm. How many beats are produced each second by the two tuning forks? The speed of sound is 340 m/sec. A. 18
B. 22
C. 14
D. 27

When you mix two waves, there are two beats produced.  The frequencies of the beats are (the sum) and (the difference) of the frequencies of the two original waves.  So we have to find the frequencies of these two forks.

Frequency = (speed) / (wavelength)

Fork #1: Frequency = (344 m/s) / (0.337 m) =  1020.8 Hz

Fork #2: Frequency = (344 m/s) / (0.3127 m) = 1100.1 Hz

The two beat frequencies are  2120.9 Hz  and  79.3 Hz.

From the choices allowed, the one they want you to pick is  80 Hz .  

Explanation:

This credit goes all to AL2006

i think the answer is b

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2