The sound from a trumpet travels at 351 m/s in the frequency of the note is 294 Hz, what is the wavelength of the sound wave?

Physics

1 answer:

NARA [144]3 years ago

3 0

Answer:

1.19m

Explanation:

Given parameters:

Speed of the trumpet sound = 351m/s

Frequency of the note = 294Hz

Unknown:

Wavelength of the sound = ?

Solution:

To solve this problem, we use the wave - velocity equation.

V = F x ∧

V is the velocity of the body

F is the frequency

∧ is the wavelength

So;

351 = 294 x ∧

∧ = $\frac{351}{294}$ = 1.19m

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Two trains move towards each other on a straight track/railroad. The left train has a constant speed of 29ms, the right train ha

laiz [17]

Answer:

The left train travels 2378 m until it reaches the meeting point.

Explanation:

The equation for the position of the trains is the following:

x = x0 + v · t

Where:

x = position at time t

x0 = initial position

v = velocity

t = time

If we place the origin of the frame of reference at the initial position of the left train, the right train will be at an initial position of 4744. 6 m relative to the left train. The velocity of the right train will be negative because it will be heading towards the origin.

At the meeting point, the position of both trains is the same:

x left train = x right train

x0₁ + v₁ ·t = x0₂ + v₂ · t

0m + 29 m/s · t = 4744.6 m - 29 m/s · t

58 m/s · t = 4744.6 m

t = 4744.6 m / 58 /s

t = 82 s

The position of the left train at that time will be:

x = x0 + v · t

x = 0 m + 29 m/s · 82 s

x = 2378 m

The left train travels 2378 m until it reaches the meeting point.