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4 years ago

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Which statement correctly describes the relationship between the energy of a wave and the wave’s amplitude? High energy waves ha

ve high amplitudes. Low energy waves have high amplitudes. High and low energy waves have the same amplitudes.

2 answers:

schepotkina [342]4 years ago

7 0

Explanation :

The energy of a wave is given by:

$E=\dfrac{hc}{\lambda}$

Where,

h is the planck's constant

c is the speed of light

$\lambda$ is the wavlength

One more factor on which the energy of the wave depends is the amplitude of the wave.

The maximum displacement of the particle is called the amplitude of the wave.

The particles transports energy from one location to another.

Hence, the correct option is (a) " High energy waves have high amplitudes".

creativ13 [48]4 years ago

6 0

Answer:

High energy waves have high amplitudes.

Explanation:

Energy of a wave is dependent on its amplitude. Larger amplitude means that more energy is transferred from one particle to another. Other factors on which energy of a wave depends are :

$E=\dfrac{hc}{\lambda}=hf$

f is frequency

$\lambda$ is wavelength

So, the correct option is (A) " High energy waves have high amplitudes".

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If it has enough kinetic energy, a molecule at the surface of the Earth can "escape the Earth's gravitation", in the sense that

user100 [1]

Answer:

$K_E=mgr_E$

Explanation:

By conservation of energy, the sum of the kinetic and gravitational potential energies at the surface of the Earth must be equal than their sum at infinity, so we have:

$K_E+U_E=K_\infty+U_\infty$

$\frac{mv_E^2}{2}-\frac{GM_Em}{r_E}=\frac{mv_\infty^2}{2}-\frac{GM_Em}{r_\infty}$

Where $G=6.67\times10^{-11}Nm^2/kg^2$ is the gravitational constant, $M_E=5.97\times10^{24}kg$ and $r_E=6371000m$ are the mass and radius of the Earth, <em>m </em>is the mass of the particle, $v_E$ its velocity at the surface of the Earth (which would be its escape velocity) and $v_\infty$ and $r_\infty$ are the velocities and distance at infinity, which would be null and infinity respectively, so the right hand side of our equation is 0J, which leaves us with:

$\frac{GM_Em}{r_E}=\frac{mv_E^2}{2}=K_E$

Also, since the force the molecule experiments is the force of gravity (disregarding drag), we can write its weight in terms of Newton's Law of Gravitation:

$F=mg=\frac{GM_Em}{r_E^2}$

Which means that:

$\frac{GM_Em}{r_E}=mgr_E$

So finally putting all together we can write:

$K_E=\frac{GM_Em}{r_E}=mgr_E$

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3 years ago

Convert 162 km/h into m/s.

patriot [66]

Answer:

45 m/s

Explanation:

162 / 3.6 = 45 m/s

Divide by 3.6 to convert km/h to m/s.

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3 years ago

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oksian1 [2.3K]

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3 years ago

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soldier1979 [14.2K]

Answer:

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Explanation:

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Buoyant force is the amount of pressure exerted on an object by the liquid it is in. Given by the formula

$F_{b} = V_{o} D_{l} g$

Where

$F_{b}$ = Buoyant Force

$V_{o}$ = Volume of Object submerged in the liquid

$D_{l}$ = Density of Liquid

$g$ = Force of gravity

Since in this question the swimmer with the sand is completely submerged in water, more of the volume of his preserver is under the water hence the buoyant force is greater on it than the swimmer with the Styrofoam (as part of him is not submerged in water)

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Mariana [72]

Explanation:

A lightning rod (US, AUS) If lightning hits the structure:-

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3 years ago