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prisoha [69]
3 years ago
15

A doctor pushes the plunger of syringe down and then pulls it up to a draw liquid into a syringe? give reason please help me wit

h very short answer
Physics
1 answer:
ruslelena [56]3 years ago
4 0

Answer:

When the doctor has the syringe, it is full of air. So, now after the doctor pushes the plunger, hence the air gets released into the medicine container. After this the doctor then takes the plunger and pull it back. Now , the air gets pulled up back into the syringe, but not only does the air come in but also the medicine because of the pressure build up.

If my answer helped, please mark me as the brainliest!!

Thank You!

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What is the definition of the half-life of a radioactive isotope?
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Answer: The half-life is the amount of time it takes for a given isotope to lose half of its radioactivity. If a radioisotope has a half-life of 14 days, half of its atoms will have decayed within 14 days. In 14 more days, half of that remaining half will decay, and so on.

8 0
2 years ago
Which fundamental force is responsible for some kinds of radioactivity
ella [17]

Answer:

weak nuclear force

Explanation:

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plz mark me as brainliest :)

8 0
3 years ago
What is the energy of a photon with a frequency of 5 x 10^14 Hz?
zloy xaker [14]

Answer:

3.315 x 10^-19 J

Explanation:

Using Eisten's formula, energy is a product of Plank's constant and photon frequency

E=hf

Where f represent frequency, h is Plank's constant and E is energy.

Substituting frequency with 5 x 10^14 Hz and

Planck's constant is 6.63 x 10^-34 J•s.

E=6.63 x 10^{-34} *5 x 10^{14}=3.315x10^{-19} J

8 0
3 years ago
A commonly used unit of mass in the English system is the pound-mass, abbreviated lbm, where 1 lbm = 0.454 kg. What is the densi
Gemiola [76]

Answer: The density of glycerine will be 0.028lbm/foot^3

Explanation:

Density is defined as the mass contained per unit volume.

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1 lbm = 0.454 kg

1 kg =\frac{1}{0.454}=2.2lbm

Thus 0.454kg=\frac{2.2}{1}\times 0.454=0.99

Also 1m^3=35.3147foot^3

Putting in the values we get:

Density=\frac{0.99lbm}{35.3147}=0.028lbm/foot^3

Thus density of glycerine will be 0.028lbm/foot^3

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3 years ago
The transfer of energy through matter by the direct contact of particles is called __________.
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The transfer of energy through matter by the direct contact of particles is called conduction
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