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Degger [83]
2 years ago
8

Assuming that 10.0% of a 100 W light bulb's energy output is in the visible range (typical for incandescent bulbs) with an avera

ge wavelength of 580 nm, and that the photons spread out uniformly and are not absorbed by the atmosphere, how far away (in km) would you be if 468 photons per second enter the 3.30 mm diameter pupil of your eye
Physics
1 answer:
Verizon [17]2 years ago
5 0

Answer:

Explanation:

10% of 100 W = 10 W .

energy of each photon = hν , h is plank's constant and ν is frequency

= hc / λ , c is velocity of light , λ is wavelength

wavelength given λ  = 580 x 10⁻⁹ m .

energy of each photon = 6.6 x 10⁻³⁴ x 3 x 10⁸ / 580 x 10⁻⁹

= .034137 x ⁻¹⁷ J

no of photons in 10 W

= 10 /  .034137 x ⁻¹⁷

= 292.9 x 10¹⁷

If d be the required distance

no of photons per unit area per second  at distance d

= 292.9 x 10¹⁷ / 4πd²

no of photons through the area of eye

= π x (1.65 x 10⁻³)² x 292.9 x 10¹⁷ / 4πd²

= 199.355 x 10¹¹ / d²

199.355 x 10¹¹ / d² = 468 ( given )

d² = 199.355 x 10¹¹ / 468

= .42597 x 10¹¹

= 42597 x 10⁶

d = 206.4 x 10³ m

= 206.3 km.

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8892 ml to grams then to mg ​
andrew11 [14]

Answer:

8892 ml = 8892 gm = 8892000 mg

1 ml = 1 gram

8892 ml = 8892 gram

1 gram or ml = 1000 milligram

8892 ml = 8892 × 1000 = 8892000 milligram

hope this helps

have a good day :)

Explanation:

remember: 1 kilogram = 1000 gram = 1000000 milligram.

Milliliter is expressed same as gram and liter is expressed same as kilogram.

1 meter = 100 cm, 1 kilometer = 1000 meter,

1 cm = 10 millimeter.

7 0
2 years ago
Read 2 more answers
What is the bending of a wave around a barrier?
Mamont248 [21]
That's wave 'diffraction'.
3 0
3 years ago
Please could someone explain this.
icang [17]

This problem is to let you practice using Newton's second law of motion:

Force = (mass) x (acceleration)

-- The airplane's mass when it takes off (before it burns any of its load of fuel) is 320,000 kg.

-- The force available is (240,000 N/per engine) x (4 engines) = 960,000 N.

-- Now you know ' F ' and ' mass '.  Use Newton's second law of motion to calculate the plane's acceleration.

7 0
3 years ago
Use the image to determine the volume of the rock.
maria [59]

Answer:

12 ml

Explanation:

The initial volume in the cylinder is 20 ml

 adding the rock adds volume to the cylinder

       the new volume is 32 ml .....the increase in volume is the volume of the rock :   32 - 20 = 12 ml    volume of rock

6 0
1 year ago
A box accidentally drops from a truck traveling at a speed of 20.0 m/s and slides along the ground for a distance of 30.0 m Calc
Hoochie [10]

Answer:

a= - 6.667 m/s²

Explanation:

Given that

The initial speed of the box ,u= 20 m/s

The final speed of the box ,v=  0 m/s

The distance cover by box ,s= 30 m

Lets take the acceleration of the box = a

We know that

v²= u ² + 2 a s

Now by putting the values in the above equation we get

0²=20² + 2 a x 30

a=- \dfrac{20^2}{2\times 30} \ m/s^2

a= - 6.667 m/s²

Negative sign indicates that velocity and acceleration are in opposite direction.

Therefore the acceleration of the box will be  - 6.667 m/s² .

6 0
3 years ago
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