What unit can be used to measure length or distance

Physics

1 answer:

strojnjashka [21]4 years ago

7 0

Answer:

The most common units that we use to measure length in the metric system are the millimeter, centimeter, meter, and kilometer.

Explanation:

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Compare blue and red light from the visible spectrum. which has: the longer wavelength? the greater frequency? the greater energ

Hitman42 [59]

1) By looking at the table of the visible spectrum, we see that blue light has a wavelength in the range [450-490 nm], while red light has wavelength in the range [620-750 nm]. Therefore, red light has longer wavelength than blue light.

2) The frequency f of an electromagnetic wave is related to its wavelength $\lambda$ by the formula
$f= \frac{c}{\lambda}$
where c is the speed of light. We see that the frequency is inversely proportional to the wavelength, so the shorter the wavelength, the greater the frequency. In this case, blue light has shorter wavelength than red light, so blue light has greater frequency than red light.

3) The energy of the photons of an electromagnetic wave is given by
$E=hf$
where h is the Planck constant and f is the frequency. We see that the energy is directly proportional to the frequency, so the greater the frequency, the greater the energy. In this problem, blue light has greater frequency than red light, so blue light has also greater energy than red light.

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3 years ago

What is the advantage of using fluorescent bulbs over incandescent bulbs?

EastWind [94]

Incandescent bulbs work by conducting an electric current along a filament made of a long, thin piece of tungsten metal. The filament must be heated to temperatures of about 2,300 degrees Celsius to glow and emit a white-hot light. But the process transforms only 5 percent to 10 percent of the electricity used into visible light. The rest is transformed into heat, which can eventually increase the temperature of a room.

CFL bulbs, on the other hand, are made of glass tubes filled with gas and a small amount of mercury. The amount is so small that an old-fashioned glass thermometer holds 100 times as much mercury as one CFL bulb. Light is emitted when mercury molecules in a CLF bulb become excited by electricity running between two electrodes at its base. The mercury emits an invisible ultraviolet light that becomes visible when it hits the white coating inside the CFL bulb.

Basically, based on how they both work, fluorescent bulbs last longer and do not release as much heat as incandescent bulbs which means it's also better for the environment.

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4 years ago

After being pushed and released, a 50 kg crate slides across a factory floor. Friction on the sliding crate is 200 N, what is th

saveliy_v [14]

F = ma
200 = 50 * a
4 = a

Therefore acceleration is 4ms^-2

6 0

3 years ago

4. How much would an object accelerate if it has a mass of 25 kg and is pushed with a force of 2 Newtons?

slega [8]

Answer:

0.4

Explanation:

f divided by m = a

3 0

3 years ago

If a negatively charged particle is placed inside a uniform electric field the electric force that will act on that particle poi

AysviL [449]

Answer:

opposite direction

Explanation:

An electric field is defined as a physical field which surrounds the electrically charged particles that exerts force on the other particles on the field.

Now when an electron or a negatively charged particle enters a uniform electric field, the electric forces acts on the negatively charged particles and it forces the particle to move in the direction which is opposite to the direction of the field. In an uniform electric field, the field lines are parallel.

6 0

3 years ago

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