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4 years ago

A wave is passing through a uniform medium. As the frequency of this wave increases, its wavelength

Physics

2 answers:

pashok25 [27]4 years ago

7 0

<h2>Answer: decreases</h2>

The speed $v$ of a wave is given by the following formula:

$v=f.\lambda$ (1)

Where:

$f$ the frequency of the wave

$\lambda$ the wavelength

But, we want to know<u> its wavelength</u>, hence we have to rewrite equation (1):

$\lambda=\frac{v}{f}$ (2)

If we are told the wave is passing through a uniform medium, this means <u>its velocity is constant</u> in this medium.

So, keeping this in mind, from (2) we are able to know that $\lambda$ is inversely proportional to $f$ .

What does this mean?

If $f$ increases $\lambda$ decreases

and

If $f$ decreases $\lambda$ increases

Therefore the correct option is b:

<h2>As the frequency of this wave increases, its wavelength <u>decreases</u>.</h2><h2 />

Lerok [7]4 years ago

5 0

B. Decreases

Why: Because the longer the wavelength the lower the frquency. The shorter the wavelength the higher the frequency.

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If the distance between the first order maximum and the tenth order maximum of a double-slit pattern is 18 mm and the slits are

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Answer:

Wavelength of light is 600 nm

Explanation:

Given

Distance between the first order maximum and the tenth order maximum of a double-slit pattern = 18 mm

Separation between the slits = 0.15 mm

Distance of screen from the slits = 50 cm

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$= \frac{18*10^{-3} * 0.15 *10^{-3}}{0.50*9} \\= 6 *10^{-7}\\= 600$ nm

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3 years ago

On a cold day you can warm your hands by rubbing them together. (a) Assume that the coefficient of friction between your hands i

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To solve this problem it is necessary to apply the equations related to the Force of Friction and Energy.

By definition the friction force is defined as

$F= \mu * N$

Where,

$\mu =$ Frictional Constant

N = Normal Force -> mg

At the same time we have the definition of the Energy, which can be

E = F*v

Where,

Force

v = Velocity.

Then replacing with our values we have that,

$F = \mu N$

F = 0.5 *34

F = 17

The energy then would be,

E = f v

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Therefore the rate at which heat is generated is 5.1W

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3 years ago

What fraction of the volume of an iceberg (density 917 kg/m3) would be visible if the iceberg floats in (a) the ocean (salt wate

kondor19780726 [428]

Answer:

a) 10.4% b) 8.3%

Explanation:

According to Archimedes' principle, any object submerged in a liquid, receives an upward force (called buoyant force) numerically equal to the weight of the volume removed by the liquid.

When this force is equal to the force of gravity on the object (which we call weight, always downward) the object floats in the liquid.

Let's see what happens in the two situations we have:

a) salt water (density 1024 Kg/m³)

We can express the force of gravity on the iceberg, as follows:

Fg = mice*g = ρice*Vice*g

For the Fb (buoyant force) , we have:

Fb= ρsw*Vsub*g, where Vsub, is the fraction of the iceberg volume that is submerged.

So we can replace Vsub as follows:

Vsub = k Vice, where k is the fraction submerged, i.e. 0<k<1.

Therefore, if we need that the iceberg float, we need that Fg=Fb, as follows:

Fg= ρice*Vice*g = Fb =ρsw*k*Vice*g (1)

Simplifying common terms, we have:

ρice/ρsw = k ⇒917 kg/m³ / 1,024 kg/m³ = 0.896

This means that 89.6% of the volume is submerged, i.e. , is not visible, so the visible percentage is just the difference between 100% and 89.6%:

Vvis = 100% - 91,7% = 10.4%

b) For fresh water, we can do the same procedure, repeating (1), with the value for density of fresh water, as follows:

Fg= ρice*Vice*g = Fb =ρsw*k*Vice*g

Simplifying common terms, we have:

ρice/ρsw = k ⇒917 kg/m³ / 1,000 kg/m³ = 0.917

This means that 91.7 % of the volume is submerged, i.e. , is not visible, so the visible percentage is just the difference between 100% and 91.7%:

Vvis = 100% - 91.7 = 8.3%

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Answer:

107

Explanation:

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3 years ago

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baherus [9]

Answer:

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Hoped I helped-

Sleepy~

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3 years ago