3 years ago

What is brightness. help asap

Physics

1 answer:

notka56 [123]3 years ago

8 0

Answer:

The subjective visual sensation related to the intensity of light emanating from a surface or from a point source.

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Write and solve a MA or efficiency problem

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Input energy is: 200 joule
Output energy is: 100 joule

100/200*100=%50 efficiency

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3 years ago

An airplane flies at airspeed (relative to the air) of 280 km/h . The pilot wishes to fly due North (relative to the ground) but

MrRa [10]

Answer:

the pilot should head the plane $7.547^{\circ}$ towarrds south- west

Solution:

The airspeed of the airplane, v = 280 km/h

The velocity of the wind, v' = 52 km/h South-west

Angle, $\theta = 225^{\circ}$

Now, measured angle in the clockwise direction from North:

$sin225 = sin(\pi + 45) = - sin 45^{\circ}$

Now,

$vsinx - v'sin45 = 0$

$280sinx = 52sin45$

$x = sin^{- 1}(\frac{52}{280}\times \frac{1}{\sqrt{2}})$

$x = 7.547^{\circ}$ south- west

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3 years ago

Perhaps to confuse a predator, some tropical gyrinid beetles(whirligig beetles) are colored by optical interference that is duet

gulaghasi [49]

Answer:

The grating spacing of the beetle is $1.078*10^{-6}m$

Explanation:

The concept to solve this problem is relate to interference effect given in the Young's Slits. Here was demonstrated that the length of the side labelled \lambda is known as the path difference. The equation is given by,

$n\lambda = dsin\theta$

Where,

$\lambda$ = wavelenght of light

N = a positive integer: 1,2,3...

$\theta$ = Angle from the center of the wall to the dark spot

d= width of the slit

Replacing our values we have that for n=1,

$dsin\theta = n\lambda$

$dsin(30)=(1)(539*10^{-9})$

$d=1.078*10^{-6}m$

Therefore the grating spacing of the beetle is $1.078*10^{-6}m$

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What happens to parallel light rays that strike a concave lens?

zhenek [66]

Due to the shape of the lens , parallel rays will be deviated

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Giant cave systems have formed through the reaction of acids with the that make up limestone.

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The answer is C. Carbonates

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