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3 years ago

What is the function of a diaphragm in a film camera

1 answer:

3 0

In optics, a diaphragm is a thin opaque structure with an opening (aperture) at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture.

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Carbon-14 has a half-life of 5,730 years. if the age of an object older than 50,000 years cannot be determined by radiocarbon da

Aleonysh [2.5K]

<h3>Answer;</h3>

Carbon-14 levels in a sample are undetectable after approximately 9 half lives

<h3>Explanation;</h3>

The half life of Carbon-14 is 5,730 years . Half life is the time taken by a radioactive material to decay by half of its original mass. Therefore, it would take a time of 5730 years for a sample of 100 g of carbon-14 to decay to 50 grams

A period of 50,000 years, is equivalent to;

 50,000÷5,730 

= 8.73 half lives

Which is approximately equal to 9 half lives.

Therefore, if the age of an object older than 50,000 years cannot be determined by radiocarbon dating, then Carbon-14 levels in a sample are undetectable after approximately 9 half lives.

6 0

2 years ago

Read 2 more answers

A 190 g air-track glider is attached to a spring. The glider is pushed in 8.6 cm against the spring, then released. A student wi

spin [16.1K]

Answer:

The spring constant = 9.25 N/m

Explanation:

The equation of an object attached to a spring that is oscillating is

T = 2π√(m/k)

Where T = period of the oscillation, m = mass of the object, k = spring constant.

Making k the subject of the equation,

k = 4π²m/T²......................... Equation 1

Note: Period(T) is the time taken to complete one oscillation

Given: T = t/10 = 9.0/10 = 0.9 s, m = 190 g = 0.19 kg.

Constant: π = 3.14

Substitute these values into equation 1.

k = 4(3.14)²(0.19)/0.9²

k = 7.4933/0.81

k = 9.25 N/m

Thus the spring constant = 9.25 N/m

5 0

2 years ago

Cheryl has a mug she says is made up of matter. Heather says that the hot choclate inside the cup is made up of matter too. Keat

dangina [55]

Answer:

Cheryl, Heather and Keaton all are correct.

Explanation:

Everything around you is made of matter and matter is anything that has mass and occupies space or in other words, anything which has volume is called matter.

Here, in the given example, Cheryl, Heather and Keaton all are correct because the mug, the hot chocolate which is inside the mug and the steam coming out of it, all have mass. Therefore, all are correct except for Mikayla.

6 0

2 years ago

Read 2 more answers

A 3kg book falls from a 2m tall bookshelf what is the speed PICTURE included

mafiozo [28]

Answer:

39.2m/s

Explanation:

The potential energy the book has right before it falls is equal to the kinetic energy in falling.

PE = KE

mgh = (1/2)mv

2gh=v