Question

Help

Answer 1

any attempts so far with a?

Answer 2

like, you just need to say something like, the uranium nucleus collides with a neutron, and splits into two smaller nuclei and some neutrons, then the smaller nuclei collide with the neutrons, releasing energy with each subsequent division

something like that

Answer 3

any attempts on b yet?

Answer 4

fpr b is it that it has very high temperatures which is why this is

Answer 5

and high pressue?

Answer 6

yeah, so we can't harness nuclear fusion in power plants b/c it requires too high of temperatures and pressure, but it can be "the original source" of electric energy because it occurs in the sun and solar power can be used to generate electricity

Answer 7

okay so for the third question it would be having to do with the nucleus I think :/ Im not sure

Answer 8

well the big thing in favor of nuclear fission is that it doesn't produce CO2

some of the cons are: radioactive pollution and uranium is a limited resource

https://www.conserve-energy-future.com/pros-and-cons-of-nuclear-energy.php

Answer 9

So two cons would be the waste and the great cost

Answer 10

sure

Answer 11

what is a blackbody radiator?

a device that absorbs radiation

Answer 12

good but to be more specific it perfectly absorbs all radiation of all frequencies

Answer 13

What was the ultraviolet catastrophe?

hypothesis that all radiation will be taken away

Answer 14

I think

Answer 15

no the energy sorry not radiation

Answer 16

sort of but a little off the track

classical physics predicted that a blackbody would emit energy depending on its temperature, but at high frequencies the energy emitted would diverge to infinity, a violation of what happens in reality (energy must be conserved)

this conflict between theory and reality is the ultraviolet catastrophe

Answer 17

what is the idea of light that is quantized

Answer 18

it is when it is absorbed

Answer 19

the important part of "quantized" is that it's absorbed/emitted at specific, discrete amounts called quanta

Answer 20

a. Write 2 – 3 sentences identifying the most widely accepted theory for the formation of the universe. In your description, be sure to include how the universe began and what is happening to the size of the universe today. (2 points)

According to the Big Bang Theory, the world began with a small ball of energy. This energy than started to expand, creating the world. Ever since then the universe keeps on expanding, according to the Big Band Theory.

Answer 21

good

Answer 22

Write 2 – 3 sentences explaining redshift and what it led scientists to conclude about the universe.

Answer 23

Im not too familiar with the redshift

Answer 24

tl;dr light from other galaxies appears red which means they're moving away from us which means the universe is expanding

Answer 25

a. How does the speed of light in a vacuum change when observed from two different frames of reference?

Answer 26

its the same

Answer 27

A+ well done

Answer 28

b. Which frames of reference can be studied using special relativity? (2 points)

Answer 29

none

Answer 30

not quite, it has to do with acceleration, are accelerating or non-accelerating frames used with special relativity?

Answer 31

accelerating

Answer 32

other way around, accelerating frames are for general relativity

non-accelerating frames are for special relativity

Answer 33

. A stationary observer measures an object that is traveling at nearly the speed of light. Describe how the length of this object compares with the length of an identical object that the observer is holding. Write 1 or 2 sentences explaining your reasoning

Answer 34

so length either gets larger or smaller at the speed of light, do you remember which one?

Answer 35

smaller

Answer 36

good so the object travelling near the speed of light has the smaller length compared to the one in the observer's hand

Answer 37

Write 2 – 3 sentences explaining how quantum mechanics describes light and matter. How does the interference pattern of electrons support the idea that matter can behave as a wave?

Answer 38

in short, quantum mechanics describes light and matter as having wave-particle duality which means they can exhibit both wave like and particle light qualities. interference is normally only a property exhibited by waves so if electrons have an interference pattern they are also wave like

Answer 39

Explain why observations of blackbody radiation provide evidence for the quantization of light.

When the blackbody is heated, it starts to glow. All atoms start to vibrate. Total heating energy must be divided and equally shared by all atoms of blackbody

Answer 40

that's not quite it, that's not why we know that light is quantized

going off of what we said earlier: classical physics predicts that energy emitted by the blackbody will diverge at small quantities. this doesn't happen in reality, which is why the quantum hypothesis was proposed, which states that only discrete amounts of light can be emitted at each temperature

Answer 41

*diverge at large frequencies

Answer 42

. Scientists have proposed three models of the universe: flat, open, and closed. Each of these describes a different future for the universe. Write 2 – 3 sentences identifying the model that is most widely accepted and describing the future of the universe according to that model. (

Answer 43

Im sorry this is the last one :/

Answer 44

It would be open?

Answer 45

not 100% sure, it's either flat or open

Answer 46

about half of the people I asked about this question say flat, the others say open

Answer 47

Lol okay , I will go with flat

Answer 48

alright

tl;dr open universe expands infinitely, flat universe expands but stops eventually and does not contract, closed universe eventually contracts