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4 years ago

What is the speed of light?

Physics

2 answers:

ozzi4 years ago

7 0

The speed of Light is 300,000,000 Meters/Seconds

Alona [7]4 years ago

3 0

C is correct....
300,000,000m/s

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The half-life of plutonium 239 is 24,200 years. Assume that the decay rate is proportional to the amount. Determine the amount o

kotykmax [81]

Answer:

time taken is equal to 14,156 years

Explanation:

we know,

$Y=Ae^{-kt}$

at t = 0

Y(0) = A

given that half life of plutonium 239 = 24,200

$\dfrac{A}{2}=Ae^{-kt}\\0.5=e^{-kt}\\k\times 24200 = ln(2)\\k = \dfrac{ ln(2)}{24200}$

$Y=Ae^{-kt}$

$\frac{3}{2} = e^{-kt}\\ln(1.5)=-\dfrac{ ln(2)}{24200}\times t\\t=-\dfrac{ln(1.5)\times 24200}{ ln(2)}\\t=14,156 \ years$

hence time taken is equal to 14,156 years

5 0

3 years ago

A projectile is launched from the ground at an angle of 60o above the horizontal. At what point in its trajectory does it have t

Elodia [21]

Answer:

It's constant everywhere in its trajectory.

Explanation:

the projectile was launched with an initial velocity, the only acceleration that is affecting the projectile's velocity is gravity.

The acceleration of gravity is practically equal everywhere on earth, so during its trajectory, we have to take into consideration only the acceleration because of gravity.

This is only correct because the projectile was launched with an initial velocity and it's not accelerating from rest and then falls.

5 0

3 years ago

How does sound travel through a medium?

Papessa [141]

Particles vibrate parallel to the direction the sound travels. It's a longitudinal wave.

4 0

3 years ago

Read 2 more answers

Could a mixture be made up of only elements and no compounds?

GaryK [48]

A mixture is made of (elements).

6 0

3 years ago

Suppose there was a star with a parallax angle of 1 arcsecond. How far away would it be? Select all that apply.

lesya692 [45]

Answer:

option E

Explanation:

given,

Parallax angle(d) = 1 arcsecond

using Parallax formula

$d = \dfrac{1}{p}$

p is the parsecs angle which is measured in 1 arcsecond

d is the distance in parsec

now,

$P = \dfrac{1}{d}$

$P = \dfrac{1}{1}$

$P = 1 \ parsec$

we know,

1 parsec = 3.26 light year

hence, the answer will be option E

6 0

4 years ago