Deck 4 = Physics 10/10/13-end Of Winter Term

Question 1

0 degrease in kelvin?

Answer 1

-273oC

Question 2

What did the plumb pudding model look like?

Answer 2

-It was a positively charged sphere with negatively charged electrons floating around in it.

Question 3

Thomson invented what?

Answer 3

-The plumb pudding model of the atom, because it looked like a plumb pudding. Negatively charged plumbs stuck into a soft doughy negatively charged football shaped sphere.

Question 4

What did the rutherford experiment prove?

Answer 4

-The Rutherford experiment managed to disproved the famous plumb pudding model of an atom. Because they discovered the nucleus. They discovered that the atom is mostly empty space.

Question 5

What did they do in the Rutherford experiment?

Answer 5

-Alpha particles were fired at the atom which was in a vacuum. they would then fire positively charged alpha particles at the atom, the positively charged alpha particles most of the time went straight through the atom but 1 in 5000 times it would be deflected by the positively charged nucleus. So the nucleus was found.

Question 6

What would have happened to most of the Alpha particles in the Rutherford experiment?

Answer 6

-Most of the particles would go straight through the atom.

Question 7

Why was the Rutherford experiment conducted in a vacuum?

Answer 7

-This was so the alpha particles would not bounce of the particles in the air.

Question 8

What charge are alpha particles?

Answer 8

-Positive.

Question 9

In the Rutherford experiment how were the alpha particles deflected and then registered?

Answer 9

-Not all the alpha particles bounced off the nucleus, some were slightly deflected, The alpha particles were then picked up by a Geiger counter that was moved around the circumference of the experiment area.

Question 10

What is an isotope?

Answer 10

-To atoms are isotopes if they have the same number of protons, but a different number of neutrons.

Question 11

14
6 C
What are the numbers are the letters?

Answer 11

• C= Carbon (carbon 14).
• 14= the top number of protons and neutrons in the nucleus (nucleon number) This is also the mass number because the mass in in the nucleus.
• 6= atomic number.

Question 12

How do you work out the mass number?

Answer 12

-It is the number of neutrons and protons in the nucleus (nucleon number).

Question 13

Observations you would make of Brownian motion?

Answer 13

-The random, zig-zag motion of smoke particles in the air, or pollen particles in water.

Question 14

Explain Brownian motion?

Answer 14

-The pollen particles are colliding with water molecules that are to small to see, this is changing the direction of the pollen particles, so the appear to be moving in a random zig-zag motion.

Question 15

What is the equation for density?

Answer 15

-density=mass/volume “rho”p=m/v.

Question 16

What is the equation for volume?

Answer 16

-v= length x depth x height (only works with cuboids).

Question 17

How do you find the volume of a cylinder?

Answer 17

-“pye” x radius2 x height.

Question 18

What is mass meaused in?

Answer 18

-(g) (kg).

Question 19

What is volume meaused in?

Answer 19

-(cm3) (m3).

Question 20

What is density meaused in?

Answer 20

-(g/cm3) (kg/m3).

Question 21

Describe how to calculate the density of an irregularly shaped object?

Answer 21

• 1) Find the weight of the object to dertermin its mass
• 2) then use a Eureka can, and place the object in it and the water that comes out will be the volume of the object.
• 3) you finally need to measure the amount of water with the measuring cylinder.

Question 22

At 0K what will happen and will you be able to get 0K?

Answer 22

-At (0K) particles will have stopped moving completely, we will never be able to do this because there always needs to be something colder (with less kinetic energy) for the heat (energy) to be transferred. So you will never be able to have an object with no kinetic energy.

Question 23

Temperature is what?

Answer 23

-It is actually how much kinetic energy the particles have.

Question 24

How do you measure the density of an object if it floats? (the object is less dense then water)

Answer 24

• 1) find the volume of a heavy object first.
• 2) then you simply weigh down the other object with the weight.
• 3) you then find the difference between the two objects.

Question 25

What inaccuracy would you have with the eureka can experiment?

Answer 25

• If the eureka can is not completely filled, then the volume will be to small.
• If the measuring cylinder is not completely dry then the volume will be to big.
• Splash from lowering objects into the water may have an effect on the result.

Question 26

What is the equation for pressure?

Answer 26

-Pressure= force/area P=F/A.

Question 27

What is force measured in?

Answer 27

-N.

Question 28

What is area measured in?

Answer 28

-N/m2.

Question 29

What is the motion of molecules in a gas?

Answer 29

-They are moving very fast and randomly.

Question 30

Why does a gas exert a pressure on the walls of a container?

Answer 30

• Because the gas particles collide with the container walls in great numbers.
• Since this force is spread over the area of the container wall, the force is divided by the area is the pressure the gas exerts.

Question 31

What effects does the temperature have on particles in the air?

Answer 31

-The spread of the gas particles increases.
-The number of times the gas particles collide with the walls, per second increases (an example would be a balloon getting bigger)
also the pressure of the gas.

Question 32

Boyle’s law?

Answer 32

-So long as the mass of the gas stays constant The temperature of the Gas will also stay constant.

Question 33

Boyle’s law equation?

Answer 33

-P1V1 = P2V2

Question 34

What is pressure measured in?

Answer 34

-(kpa)

Question 35

What is equation for pressure when you have density?

Answer 35

-Pressure = “rho” pgh

Question 36

What is gravitational field strength measured in?

Answer 36

-N/kg