Physics, 27.12.2019 15:31 andrewlawton8125

When a 440-hz tuning fork and a piano key are struck together, five beats are heard. if the pitch of the note on the piano is higher than the tuning fork, what is the frequency of the note?

440 hz
445 hz
435 hz
435 or 445 hz

Answers: 3

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Answers

For the answer to the question above asking, what is the frequency of the note when a 440-Hz tuning fork and a piano key are struck together, five beats are heard. If the pitch of the note on the piano is higher than the tuning fork?
42/2 = 21Hz 2) 440-5 =
So the answer would be the third one among the given choices which is 435 Hz

Answer from: Dillpickle3322

The frequency of the note is 435 Hz and 445 Hz.

(d) is correct option.

Explanation:

Given that,

Frequency of tuning fork= 440 Hz

Heard of beat = 5

We know that,

The difference between the frequencies of the note and the tuning fork gives the frequency of the beats.

$f_{b}=f_{t}-f_{n}$ ...(I)

$f_{b}=f_{n}-f_{t}$ ....(II)

Here, $f_{b}$ =beat number

$f_{t}$ = frequency of tuning fork

$f_{n}$ = frequency of note

Put the value in equation (I)

$5= 440-f_{n}$

$-f_{n}=-440+5$

$f_{n}=435\ Hz$

Now, put the value of $f_{b}$ and $f_{t}$ in equation (II)

$f_{b}=f_{n}-f_{t}$

$5=f_{n}-440$

$f_{n}=445\ Hz$

Hence, The frequency of the note is 435 Hz and 445 Hz.

Answer from: Quest

answer: b.

explanation:

Answer from: Quest

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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