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3 years ago

The findings of Henri Becquerel and the Curies helped to discredit what notion held for a very long time?

Physics

1 answer:

Dovator [93]3 years ago

4 0

The findings of Henri Becquerel and the curies have a significant effect in the field of radio activity.

Henri is considered as the father of radioactivity.He was the first one conducted experiment on the radioactivity and describe the nature of alpha and beta particles with gamma radiations.Before him, it was considered that every nuclei is stable and does not undergo decay.

The Curie couple conducted experiment on artificial radioactivity and invented radium by artificial transmutation.

Hence the findings of Henri and the curie helped to credit the notion that matter is radioactive in nature and decays with the course of time.

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6. How much heat is absorbed by a persons hand if 100 grams of liquid water at 100°C is poured on his hand? (Assume the final te

damaskus [11]

The heat absorbed by a persons hand is 26,359.2 J.

<h3>Heat absorbed</h3>

The quantity of heat absorbed by the persons hand is heat gained or transferred from the hot water to cold hand. This is based on the principle of conservation of energy.

The quantity of heat absorbed is calculated as follows;

Q = mcΔθ

where;

Q is the quantity of heat absorbed
m is mass of the liquid
Δθ is change in temperature

Q = 100 x 4.184 x (100 - 37)

Q = 26,359.2 J

Thus, the heat absorbed by a persons hand is 26,359.2 J.

Learn more about heat capacity here: brainly.com/question/16559442

5 0

2 years ago

Suppose that the ultrasound source placed on the mother's abdomen produces sound at a frequency 2 MHz (a megahertz is 10^610 6

ella [17]

Answer:

the maximum frequency observed is 2.0044 10⁶ Hz

Explanation:

This is a Doppler effect exercise. Where the emitter is still and the receiver is mobile, therefore the expression that describes the process is

f ’= $f_o \ ( \frac{v \pm v_o}{v} )$

the + sign is used when the observer approaches the source

typical speeds of a baby's heart stop are around 200 m / min

let's reduce to SI units

v₀ = 200 m / min (1 min / 60 s) = 3.33 m / s

let's calculate

f ’= 2 10⁶ ( $\frac{1500 \ \pm 3.33}{1500}$ )

f ’= 2.0044 10⁶ Hz

f ’= 1,9956 10⁶ Hz

therefore the maximum frequency observed is 2.0044 10⁶ Hz

8 0

3 years ago

What are the consequences of fertilizing chemicals in water?

Archy [21]

It can cause the water to create algae.

5 0

4 years ago

A negative charge feels a force when stationary in an electric field. moving parallel to an electric field. moving parallel to a

Yuki888 [10]

Answer:

stationary in an electric field.

moving perpendicular to a magnetic field.

moving perpendicular to an electric field.

Explanation:

Negative charge: In physics, the term "negative charge" is defined as a phenomenon that consists of a surplus or different electrons in any field i.e magnetic or electric field.

However, the correct answer in the question above, would be:

"stationary in an electric field".

"moving perpendicular to a magnetic field".

"moving perpendicular to an electric field".

8 0

3 years ago

The Stronger the force that is exerted on an object,the ____ the change in velocity will be.

leonid [27]

osisisksj

#sorryneedpoints

5 0

3 years ago

Read 2 more answers