Answer:
The luminosity remains the same, but the apparent brightness is decreased by a factor of four.
Explanation:
The apparent brightness, F = L/4πr² where L = luminosity and r = distance between us and the star.
Since L is independent of the distance between us and the star, it is constant, then
F ∝ 1/r²
So, F₁/F₂ = r₂²/r₁² where F₁ = apparent brightness at r₁ and F₂ = apparent brightness at r₂
If the distance is doubled, that is r₂ = 2r₁, then
F₁/F₂ = r₂²/r₁²
F₁/F₂ = (2r₁)²/r₁²
F₁/F₂ = 4r₁²/r₁²
F₁/F₂ = 4
F₂ = F₁/4
So, since the luminosity is constant, <u>the luminosity remains the same, but the apparent brightness is decreased by a factor of four.</u>
<span>a) light is a form of matter less dense
than air
b) light travels in straight lines
c) light has different
colors
d) light has different intensities and can be dim or bright
Yes, thank you for coming back and supplying the list of choices.
At the level of Physics all the way up to somewhere in college, <em>choice-a)</em>
is not a property of light.
</span>
Answer: Total work produced = 1.355 × 10^5 KJ
Explanation:
Substance :H2O, V1=1m3
State1= sat. liquid, T1=200°C, x1=0
State2= sat.mixture, T1=200°C, x2= 0.8
v1=vf=0.001157m3/kg, vg=0.12721m3/kg
P1=P2=Psat. =1554.9 KPa
v2= vf+x2 (vg-vf) =0.001157 +0.8(0.12721-0.001157)=0.102m3/kg
V2= V1×v2/v1 = 1× 0.102/0.001157 =88.159m3
W= P(V1-V2) =1554.9(88.152- 1) = 1.355x10^5KJ
Answer:
With all of that information, he's telling us the train's VELOCITY.
Explanation:
Velocity is a vector quantity made of two parts: speed and direction.
-40 c = -40 f but k would be 233.15