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3 years ago

Which condition is essential for the formation of a standing wave?

Physics

1 answer:

frosja888 [35]3 years ago

4 0

Half a wavelength must fit exactly into the length of a vibrating cord

Explanation:

A standing wave is a wave produced by the interference between a wave and its reflection. A standing wave is the wave produced, for instance, in the string of a guitar.

A standing wave is different from other types of waves because it does not propagate in space, but it only vibrate in a fixed region.

A standing wave is characterized by the presence of:

Nodes: points where the amplitude of the wave is always zero (destructive interference)
Antinodes: points where the amplitude of the wave is maximum (constructive interference)

The two ends of the string do not vibrate: this means that they always correspond to two nodes. If we take the fundamental mode of vibration of the string (so, no other nodes), we see that the length of the string corresponds to the distance between two consecutive nodes: however, this also corresponds to half the wavelength of the wave. Therefore, we can conclude that the correct option is

Half a wavelength must fit exactly into the length of a vibrating cord

Learn more about waves:

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Please do it to me thank alot

faltersainse [42]

Answer:

See explanations below

Explanation:

For resistors in series, the will be added for those in parallel, we will take the sum of their reciprocal

A) 3 2ohms resistors in series

Equivalent resistance = 2 + 2 + 2

Equivalent resistance = 6ohms

B) 2 4 ohms resisstors in parallal

1/R = 1/4 + 1/4

1/R = 2/4

R = 4/2

R = 4ohms

Equivalent resistance is 2ohms

C) 4 ohms with in series with 8ohms = 4 + 8

Equivalent resistance = 4 + 8

Equivalent resistance = 12ohms

D) 4 ohms and 2 ohms in parallel is expressed as;

1/R = 1/4 + 1/2

1/R = 1+2/4

1/R = 3/4

R = 4/3

4/3 ohms in series with 6ohms

Equivalent resistance = 4/3 + 6

Equivalent resistance =4+18/3

Equivalent resistance = 22/3 ohms

8 0

3 years ago

28. (a) A pendulum that has a period of 3.00000 s and that is located where the acceleration due to gravity is 9.79m/s2 is moved

Lina20 [59]

Answer:

See below ↓

Explanation:

Assuming the motion of a simple pendulum, the time period is given by

⇒ T = 2π√(L/g)
⇒ T₁/T₂ = √(g₂/g₁)

The values we have

T₁ = 3 s
g₁ = 9.79 m/s²
g₂ = 9.82 m/s²

Solving

T₂ = T₁/√(g₂/g₁)
T₂ = 3/√(9.82/9.79)
T₂ = 3.004593 seconds

This many digits are needed because the acceleration is changed by a very small percentage (roughly 2 decimal places)
So on taking the square root of the ratio of the gravity due to acceleration (2 values), 4 decimal places will be present at the very least

7 0

2 years ago

The height of a helicopter above the ground is given by h = 3.25t3, where h is in meters and t is in seconds. At t = 2.25 s, the

blondinia [14]

Answer:

In 2.748 sec the mailbag reached the ground

Explanation:

We have given height from the ground $h=3.25t^3$

At t =2.25 sec helicopter releases a small mailbag so at t = 2.25 sec height from the ground $h=3.25t^3=3.25\times 2.25^3=37.01m$

When the mail box is drooped its initial velocity would zero so u = 0 m/sec

Acceleration due to gravity $g=9.8m/sec^2$

According to third law of motion $h=ut+\frac{1}{2}gt^2$

$37.01=0\times t+\frac{1}{2}\times 9.8\times t^2$

$t^2=7.553$

t = 2.748 sec

4 0

3 years ago

A transformer connected to a 120--V ac line is to supply 12.0V (rms) to a portable electronic device. The load resistance in the

Troyanec [42]

We don't know anything about the structure or materials of the real transformer, so all we can do is assume that it's ideal, with no losses.

1). N1/N2 = 120v/12v = 10:1

2). I = V/R = 12/4.7 = 2.55 Amperes

3). Power = V²/R = (12)² / 4.7 = 30.64 watts

4). Power = V² / R

R = V² / power

R = (120)² / (30.64 watts)

R = 470 ohms

3 0

4 years ago

Why do trains use steel wheels rather than rubber tires? A) Stee

kotegsom [21]

D) steel wheels reduce friction, thus requiring less force to move the load. Friction between rubber and steel would be greater than steel and steel. Friction creates heat, which represents a loss of energy (which has to come from somewhere else - likely from the kinetic energy of the train)

4 0

3 years ago

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