How can we make a non-luminous object luminous?

Physics

1 answer:

kompoz [17]1 year ago

6 0

Answer:

the filament in an incandescent light bulb

Explanation:

luminous objects are those which cannot emit any light but they can reflect light if light falls on them. For example, moon is non luminous but it reflect light when sun light falls on it.

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A plane electromagnetic wave with wavelength 3.0 m, travels in free space in the+xdirection with its electric field vector~E, of

mart [117]

Answer:

f =1 10⁸ Hz

Explanation:

The speed of an electromagnetic wave is given by

c = Lam f

In our case, the wavelength is 3.0 m, so we can clear the frequency

f = c / Lam

f = 3 108/3.

f =1 10⁸ Hz

6 0

3 years ago

A lion has a mass of 45 kg. Answer the following questions about it, using correct units. a. The lion runs at a speed of 14.2 m/

Eva8 [605]

A) The kinetic energy of an object is given by:
$K= \frac{1}{2}mv^2$
where m is the mass of the object, and v its speed. For the lion in our problem, m=45 kg and v=14.2 m/s, so its kinetic energy is
$K= \frac{1}{2}mv^2= \frac{1}{2}(45 kg)(14.2 m/s)^2=4537 J$

b) the increase in gravitational potential energy of the lion is given by:
$\Delta U = mg \Delta h$
where g is the gravitational acceleration, and $\Delta h$ is the increase in altitude of the lion. In this problem, $\Delta h=28 m$ , so the increase in gravitational potential energy is
$\Delta U=mg \Delta h=(45 kg)(9.81 m/s^2)(28 m)=12361 J$

c) When the fox reaches the top of the tree, its gravitational potential energy is
$U=mgh=(1.8 kg)(9.81 m/s^2)(3.8 m)=67 J$
As it jumps, its kinetic energy is
$K= \frac{1}{2}mv^2= \frac{1}{2}(1.8 kg)(8.1 m/s)^2=59 J$
So the total mechanical energy of the fox as it jumps is
$E=U+K=67 J + 59 J =126 J$

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3 years ago

Which is the most likely location in the home for mold growth? A) bathroom windows B) living room furniture C) computer keyboard

FinnZ [79.3K]

Answer:

Explanation:

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3 years ago

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What is the difference between an atom in the ground state and an atom in an excited state

SIZIF [17.4K]

The atom in an excited state has more energy and is less stable than the atom in the ground state.