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3 years ago

Does light always travel at the same speed?

Physics

1 answer:

sp2606 [1]3 years ago

6 0

Light's speed only depends on the substance (medium) it's moving through.

It travels at a constant speed as long as it stays in the same medium.

Light has the fastest speed when it's in vacuum, and nothing moves faster than that speed.

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Derive an equation<br>Ta=1.44T1/2

ivann1987 [24]

Answer:

To derive an equation you must indicate the variable you want to solve for.
Here we have tension of an object A and Tension 1.
Two variables or unknown are given hence we cannot derive any other equations.

8 0

3 years ago

On an asteroid, the density of dust particles at a height of 3 cm is ~30% of its value just above the surface of the asteroid. A

Anvisha [2.4K]

From the law of atmosphere

$N_v(y) = n_0*e^{-\frac{mgy}{Kb*T}}$

Where

$n_0$ = constant and is number density where the height y = 0cm

$n_V$ = Number density at height y=3cm

Kb = Boltzmann constant $= 1.38*10^{-23}J/K$

$T=20K$

$m = 10^{-19}kg$

Re-arranging the equation to have the value of the gravity,

$\frac{N_v(y)}{n_0} = e^{-\frac{mghy}{KbT}}$

$ln(\frac{N_v(y)}{n_0}) = -\frac{mgy}{KbT}$

Since it is 30% of value above surface, therefore $N_v = 0.3n_0$

$ln(\frac{0.3n_0}{n_0}) = -\frac{mgy}{KbT}$

$g = -\frac{KbT ln(0.3)}{my}$

$g = -\frac{(1.38*10^{-23}J/K)(20K)(Ln(0.3))}{10^{-19}(3*10^{-2})}$

$g = \frac{1.38*2*ln(0.3)*10^{-22}}{3*10^{-4}}$

$g = 1.104*10^{-1}m/s^2$

$g = 0.1m/s^2$

Therefore the correct answer is C.

4 0

4 years ago

Find the circumference of a circle whose area is 452.16 square meters. (Use 3.1416 as the value of .)

kakasveta [241]

1) The area of a circle is given by

$A=\pi r^2$

where r is the radius of the circle. In this problem, we are told that the area is

$A=452.16 m^2$

so we can rearrange the previous equation to calculate the radius:

$r=\sqrt{\frac{A}{\pi}}=\sqrt{\frac{452.16 m^2}{3.1416}}=12.0 m$

And now we can find the circumference, by using the formula:

$c=2 \pi r=2 \pi (12.0 m)=75.3984 m$

Therefore, the correct answer is D. 75.3984 meters.

2) The volume of a cube is given by:

$V=L^3$

where L is the length of the edge. In this problem, L=6 cm, therefore the volume of the cube is

$V=L^3=(6 cm)^3=216 cm^3$

and so, the correct answer is A. 216 cu. cm.

5 0

4 years ago

When _______ light passes through a prism or diffraction grating

lana66690 [7]

I don’t know ... sorry

5 0

4 years ago

Anybody know the answer??

omeli [17]

Answer:

Centimeter

Explanation:

We know the measurement is defined as:

1 meter= 100cm

1 cm= 1/100 meter

1 centimeter= 0.01 meter

Therefore, 0.01 meter is equal to 1 cm or 1 centimeter.

6 0

3 years ago

Read 2 more answers