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3 years ago

5

Which are characteristics of the speed of light? Check all that apply.

2 answers:

natali 33 [55]3 years ago

7 0

The speed of light is the speed all waves travel ?
No, only the speed of all electromagnetic waves.
It's different for ocean waves, rope waves, sound waves,
guitar-string waves, slinky waves, etc.

The speed of light is the speed electromagnetic waves travel ?
Yes. Light is one of the electromagnetic waves.

The speed of light is 3.0 x 108 m/s in space ?
Yes. That's a good approximation, and a nice easy number
to remember.
It's only about 0.07% faster than the real number: 2.99792458 x 10⁸ m/s .

The speed of light is the same in all matter ?
No. It's different in every substance, and the speed in any
substance is less than the speed in space (vacuum).

The speed of higher frequency light slows down
more than lower frequency light in matter ?
Yes, slightly. That's why the colors spread out on the way
through a prism to make a spectrum, or on the way through
raindrops to make a rainbow.

Vesnalui [34]3 years ago

4 0

Answer:

B C and E

Explanation:

B: The speed of light is the speed electromagnetic waves travel

C: The speed of light is 3.0 x 108 m/s in space.

E: The speed of higher frequency light slows down more than lower frequency light in matter.

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3 years ago

What is the volume V of a sample of 4.00 mol of copper? The atomic mass of copper (Cu) is 63.5 g/mol, and the density of copper

rusak2 [61]

Answer : The volume of a sample of 4.00 mol of copper is $28.5cm^3$

Explanation :

First we have to calculate the mass of copper.

$\text{ Mass of copper}=\text{ Moles of copper}\times \text{ Molar mass of copper}$

$\text{ Mass of copper}=(4.00moles)\times (63.5g/mole)=254g$

Now we have to calculate the volume of copper.

Formula used :

$Density=\frac{Mass}{Volume}$

Now put all the given values in this formula, we get:

$8.92\times 10^3kg/m^3=\frac{254g}{Volume}$

$Volume=\frac{254g}{8.92\times 10^3kg/m^3}=2.85\times 10^{-2}L=2.85\times 10^{-2}\times 10^3cm^3=28.5cm^3$

Conversion used :

$1kg/m^3=1g/L\\\\1L=10^3cm^3$

Therefore, the volume of a sample of 4.00 mol of copper is $28.5cm^3$

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