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3 years ago

How are potential and kinetic energy related to one another?

Physics

1 answer:

Dafna11 [192]3 years ago

3 0

Potential energy is the energy that can be stored in a system when certain types of forces act between its components. Kinetic energy is the energy associated with the motion of an object. According to conservation of energy, the total energy of an isolated system remains constant , energy may change from one form to another form within a system. Loss in potential energy is converted into kinetic energy and vice versa. Example is roller coaster. At the top most point of the track, all the potential energy is stored in the cart. As the cart moves towards bottom most point, potential energy converts into kinetic energy but the total energy of the system remains constant. i.e ( initial potential energy + initial kinetic energy = final potential energy + final kinetic energy). Hope this helps!

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Monochromatic light of wavelength λ=136.8μ m is shone at normal incidence through a thin film of thickness t resting atop a full

inn [45]

Answer:

1.8 × 10⁻⁸ Hm

Explanation:

Given that:

The refractive index of the film = 19

The wavelength of the light = 136.8 μ m

The thickness can be calculated by using the formula shown below as:

$Thickness=\frac {\lambda}{4\times n}$

Where, n is the refractive index of the film

${\lambda}$ is the wavelength

So, thickness is:

$Thickness=\frac {136.8\ \mu\ m}{4\times 19}$

Thickness = 1.8 μ m

Since,

1 μ m = 10⁻⁸ Hm

So,

Thickness = 1.8 × 10⁻⁸ Hm

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Which of the following statements about X-rays and radio waves is not true? Which of the following statements about X-rays and r

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Answer:

X-rays travel through space faster than radio waves.

Explanation:

Electromagnetic waves consist of oscillations of the electric and the magnetic field in a plane perpendicular to the direction of motion the wave.

All electromagnetic waves travel in a vacuum always at the same speed, the speed of light, whose value is:

$c=3.0\cdot 10^8 m/s$

Electromagnetic waves are classified into 7 different types, according to their wavelength/frequency. From shortest to longest wavelength (and so, from highest to lowest frequency), we have:

Gamma rays

X rays

Ultraviolet

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Infrared radiation

Microwaves

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Now we can analyze the 4 statements:

X-rays and radio waves are both forms of light, or electromagnetic radiation --> TRUE. They are both types of electromagnetic waves.

X-rays have higher frequency than radio waves. --> TRUE, as we can see from the table above.

X-rays have shorter wavelengths than radio waves. --> TRUE, as we can see from the table above.

X-rays travel through space faster than radio waves. --> FALSE: all electromagnetic waves travel in space at the same speed, the speed of light.

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