Physics, 02.07.2019 08:00 lucky1940

Describe three uses of radioactive isotopes.

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Answer from: sana20

1. Archaeological Dating. Carbon-14 is often used to find the age of a substance many years old.

2. In the use of x-rays and cat scans. X-Ray technicians often inject radioactive iodine in ones system to increase the contrast between soft tissue and bone on an x-ray image.

3. Smoke detectors: Americium is often used in smoke detectors because it is very sensitive to burning carbon dioxide.

Answer from: Quidlord03

Radioactive isotopes are used in medicine to detect medical problems and treat some diseases. They are used in agriculture to better understand the biological and chemical processes in plants. In geology, radioactive isotopes are used to determine the age of rocks and fossils. In archaeology, they are used to determine the age of ancient artifacts.

Explanation:

Just got it from the test.

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Describe three uses of radioactive isotopes....

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