Many smoke detectors contain:

Mathematics

1 answer:

Yanka [14]3 years ago

3 0

Answer:

Option B, Americium-241, is the right answer.

Step-by-step explanation:

A device which senses smoke usually as an indicator of fire is known as a smoke detector.
The two most common types of smoke detectors are the Ionization chamber and photoelectric smoke indicators.
Many of these smoke detectors comprise some amount of americium-241, which is a radioactive substance.
These smoke detectors respond immediately to fires that give off some smoke.

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A stadium has central rectangular area 125m long by 80 m wide there are two semicircular ends.running tracks goes all way round

olga_2 [115]

) Using formula for cicumference.

Circumference = Pi * diameter

Circumference = Pi * 80m

Circumference = 251.2m.

Total inside length of the curved ends.

2)Total distance round inside of track =

2(125) + 251.2m

= 250 + 251.2

= 501.2m

3) Area of circular ends =

Pi*r^2

= Pi*40^2

= 5024m^2

Area of central area (rectangle)

length * width

125m * 80m

= 10,000m^2

Total area inside track =

5,024m^2 + 10,000m^2

= 15,024m^2

Hope this helps.

:-)

7 0

3 years ago

What are the solutions if 1/4x^2 =-1/2x+2?

Oksi-84 [34.3K]

Answer:

Step-by-step explanation:

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