Recent content by Metals

Young's Modulus is usually defined as the intrinsic property of a material indicating it's stiffness, or it's ability to resist deformation. Though, it is measured in Pa, meaning it should have some statistical description. Spring constant, for example, can be define as the stiffness of an item...

I can settle for 1 and 6, though 2 - 5 still remain. These are relatively quick to answer, I just need a brief explanation and/or confirmation on whether I am correct or not. Many thanks.

A few quick questions I'd like cleared up:1) Alkali metals are said to have a really low threshold energy, enough for visible light to cause the photoelectric effect. Does this mean if I aim a flashlight (turned on) at a piece of sodium, I could ionise it? Simply flashing a light over a piece of...

My first question was confirmed, thank you, but the second and third are yet to be answered. It's especially the second that confuses me. If Young's Modulus is not related to the dimensions of a material, why does it incorporate them (A in stress and l in strain) whilst spring constant does not?

I have read that Young's Modulus, like spring constant, is a measure of stiffness (how hard it is to deform a material). Though apparently, Young's Modulus is a way of doing so that applies only to the material and not its shape, where a spring constant value depends on the dimensions of the...

Ah so the energy output is whatever the battery supplies regardless of light, but because red light naturally has less energy, more red photons must be emitted in comparison to blue so that output energy is met? But in the case of stars, more energy released will show blue flames because there...

Now I'm aware of how at around 300 degrees C N2O breaks apart, resulting in more oxygen in the cylinders. I'm also aware that N2O cools down the air fuel mixture when it evaporates, increasing density and resulting in more volumetric efficiency. What I don't get, is why not just take in more...

I see. Why is it that LEDs don't do that by the way? Say, with the same power source. And if they did, then blue light would have more power consumption? Why would blue be at lower intensity? Surely it would be higher considering it has more energy. So wave frequency is completely irrelevant...

This says that resistors change the current, as I believed. This says that resistors change current, as I believed. This point then contradicts what the two previous ones stated, saying that it's the voltage which is affected by a resistor. I believed that voltage remained constant, and the...

Referring to LEDs as I'm not aware of any other "colour-producing" light, does blue light use more energy than red light? Planck's formula (E=hf) leads me to believe that blue light would drain a battery quicker than red, due to its higher frequency. Surely a device emitting blue light would...

So from this I understand that after current passes through a resistor and its value decreases, that value remains constant in a series circuit. What I don't understand, is why adding more resistors after the first one has no further effect on the current. Why don't additional resistors change...

Much appreciated, this helped me out. My main reason for struggle was the fact I wasn't aware that the current of a series circuit was constant. With that in mind, it made answering the questions easier. My issue is, I had always thought against this. Surely adding a resistor would decrease the...

Yes I meant in parallel. Anyone able to answer those question? I'd be grateful, especially for the first one.

Here is an image with information: https://i.snag.gy/UMCRig.jpg I have calculated the total power dissipation as 11W. What I don't see is why R1 has a higher dissipation rate than R2/R3, and my main question is how do I calculate the power dissipation of R1? I get that R2/R3 are in series so...

Now I'm familiar with how nuclear fission works to produce thermal energy and alpha/ beta/gamma radiation, but how do they work in the bomb? When is the high energy neutron fired into the uranium-235, and when does the chain reaction producing the heat begin? Why is it that there's a huge...