Musicians can use beats to tune their instruments. one flute is properly tuned and plays the musical note a at exactly 440 hz. a second player sounds the same note and hears that her instrument is slightly "flat" (that is, at too low a frequency). playing at the same time as the first flute, she hears one loud-soft-loud beat per second. what is the frequency of her instrument?

439 Hz

Explanation:

= Frequency of first wave = 440 Hz

F = Beat frequency = 1 Hz

= Frequency of the instrument

The beat frequency is the difference of the two waves which are interacting with each other

The frequency of the instrument is 439 Hz

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper