All categories

4 years ago

Which scientist discovered the two radioactive elements radium anf polonium

Physics

2 answers:

jeka57 [31]4 years ago

8 0

Pierre curie was the one who discovered radium

cricket20 [7]4 years ago

7 0

Answer:

Marie Curie & Pierre Curie

Explanation:

Marie Curie along with her husband Pierre Curie was studying the radioactivity of pitchblende, (also called uranite), the uranium ore

They found that the radioactivity of the pitchblende was radioactive even after removing Uranium and Thorium from it.

In July 1898 they isolated polonium from pitchblende and in December 1898 they isolated radium from pitchblende.

They named polonium after Poland, the homeland of Marie Curie.

You might be interested in

What is the final temperature when 50 g of water at 20°c is mixed with 75 g of water at 60°c

tatyana61 [14]

44C i think. Do you have options for the answer?

4 0

3 years ago

Faraday's law states that voltage can be changed by moving the coil out of the magnetic field true or false

NNADVOKAT [17]

As per Faraday's law of induction we know that induced EMF in a conducting closed loop is equal to rate of change in flux in that loop

So here we have

$V = \frac{d\phi}{dt}$

now when we move out a coil from magnetic field then in this case there will be EMF induced in that coil as here magnetic flux is changing with time linked with the coil.

Now this induced voltage will remain constant if coil is moved out uniformly

But it will not remain constant if coil is moved out with non uniform speed

So this statement is not always true

so answer must be

<u>FALSE</u>

8 0

3 years ago

In March 2006, two small satellites were discovered orbiting Pluto, one at a distance of 48,000 km and the other at 64,000 km. P

Natasha_Volkova [10]

Answer

given,

distance of first satellite = 48,000 Km

distance of second satellite = 64,000 Km

orbital period = 6.39 day

Using equation of time period

$T = \dfrac{2\pi r^{3/2}}{\sqrt{Gm_{pluto}}}$

now, from the above equation we can say that only variable is Time period and r is the radii of orbit.

from the first satellite

$\dfrac{T_{charon}}{r^{3/2}_{charon}}=\dfrac{T_{sat1}}{r^{3/2}_{sat1}}$

$T_{sat1}=\dfrac{T_{charon}\ r^{3/2}}{r^{3/2}_{charon}}$

$T_{sat1}=\dfrac{6.39\times (48000)^{3/2}}{19600^{3/2}}$

$T_{sat1}=24.5\ days$

for second satellite

$T_{sat2}=\dfrac{T_{charon}\ r^{3/2}_{sat2}}{r^{3/2}_{charon}}$

$T_{sat1}=\dfrac{6.39\times (64000)^{3/2}}{19600^{3/2}}$

$T_{sat1}=37.7\ days$

7 0

3 years ago

The response of an object to the force of gravity is called

Nadusha1986 [10]

Reaction force/support force/ lift/ buoyancy/ weight depends on situation

5 0

3 years ago

Which of the following lists the stars in order from least density to greatest density?

BARSIC [14]

The following lists of stars in order from least density to greatest density are giant, main sequence star, white dwarf, neutron star. The answer is letter B. Aside from neutron star being the densest star, it is also the smallest star compared to the giant star, as its name implied.

6 0

3 years ago