1

Just Chat! / Re: A Short puzzle with dogs.

« on: 12/05/2022 18:37:43 »

Ok, I’m limited on wifi time available so complete guess (based on other physics)
I describe route by 2 straight lines, one towards the river which when hits river 2nd line goes to home. Angles on either side of perpendicular to river have to be the same.

2

Cells, Microbes & Viruses / Re: How can I find tardigrades?

« on: 04/04/2022 08:31:21 »

Perhaps the moss I have been examining has been to dry.

They can become dormant and difficult to see if too dry. Try soaking the moss overnight then look at it with a hand lens - best with top or side lighting (try both) against a dark background.
Although they like damp moss, they seem to prefer drying out occasionally so don’t choose moss that’s damp all the time.
When you are looking under the microscope try spacing the cover slip by putting 2 others underneath on either side, it leaves a small gap between slide and cover slip.
Best of luck

3

Physics, Astronomy & Cosmology / Re: Can sand/salt permanently molecules absorb resonate frequency?

« on: 07/03/2022 08:56:50 »

Hi.

The patterns formed on Chladni plates are a result of the properties of the plates themselves, and has nothing to do with the sand/salt/sugar/dust/etc. placed on top for visualization purposes.

   Almost entirely true.
   If you get silly and start using extremely fine grained powders you sometimes do get alternative patterns forming.   

Chladni also saw this effect on very fine particles, Faraday thought it was due to air currents carrying the particles around.
Interestingly, you get an effect in water where even large particles move to the antinodes. It’s been suggested that the drag force of the water makes it harder for them to lift off the surface and they are driven horizontally by surface waves on the plate and gravity. In order to see why it happens you have to average the horizontal forces over a complete cycle, otherwise it appears counterintuitive.

However, the supposition by the OP of a memory effect is still incorrect 

4

General Science / Re: Do air sealing machines really preserve our food?

« on: 26/02/2022 22:49:59 »

Is it better to air seal our food or simply put it in the freezer?

Both

5

Physics, Astronomy & Cosmology / Re: Can sand/salt permanently molecules absorb resonate frequency?

« on: 22/02/2022 20:28:31 »

The patterns formed on Chladni plates are a result of the properties of the plates themselves, and has nothing to do with the sand/salt/sugar/dust/etc. placed on top for visualization purposes. ..... The pattern that the nodes make is a function of the frequency of the vibration and the size/shape of the plate.

Fully agree, acid test is that the pattern changes with frequency, so there is no memory effect.
PS I use tea leaves, but don’t read anything into that 

6

Just Chat! / Re: Is there a maximum frequency for a gamma ray?

« on: 22/02/2022 00:17:24 »

....we did all just step around the possibility that if you push the frequency of the gamma ray higher then we could get outside the range of energy that most of the current scientific theories work with.

As this is informal, otherwise much would go into new theories, although the new theorists proposing these ideas are orders of magnitude brighter than the ones we get here. There is interesting work being done at CERN, some on photon/photon collisions which don’t happen at low energies. Some work on questioning whether high energies might reveal extra dimensions via Kaluza-Klein states, or might reveal gravitons which wouldn’t be detected, but could be lost into the extra dimension leaving an energy momentum imbalance.
Don’t worry about the discussions on the very short wavelengths/high energies needed to make measurements near planck length creating a black hole. As you’ve no doubt realised, the energy needed to create John Wheeler's kugleblitz put it out of being a credible possibility. However, it’s still a lot less than Asimov’s suggestion.

7

Just Chat! / Re: Is there a maximum frequency for a gamma ray?

« on: 21/02/2022 09:05:23 »

Isaac Asimov says that the photon energy of a gamma ray cannot exceed to the total mass-energy of the universe.

Great writer with lots of good ideas, but, although he’s right in principle  I think the limit is much lower than this.
Most assessments I’ve seen on this suggest that the amount of energy needed to probe something at the plank length is around that needed to create a black hole.
This is one reason why we think that although plank length probably isn’t the smallest length that could exist, it might be the smallest we can investigate.

8

New Theories / Re: Scientific Falsification of the Theory of Evolution (ToE) and Introducing ToE's

« on: 19/02/2022 18:46:24 »

Oh please, don't give me the wrong advice of explaining reality and don't use Darwin's invented criteria of falsification. To falsify ToE, you need to use this approach: ToE vs reality, and never, ever rely on Darwin's idea. Behe had done that. He was ashamed.

You claim to have reviewed all ToE papers and falsified them. You have 24hrs to provide the list you claim or you posts will be locked until you provide that list.
You agreed not to post false information when you registered on this forum.

9

Physics, Astronomy & Cosmology / Re: If space-time can curve near a black hole, can we drag + move it?

« on: 04/02/2022 08:53:47 »

Hi.

   Could someone clarify how these things work?   Whenever the posts start of with  "Donald presented this...."  or   "Donald wrote in to ask this.....",    then   we're never going to get any interactivity with Donald are we?   
   So am I right that if I asked Donald to clarify a few details, then I'd be wasting my time?

As @evan_au says, these are emailed in. However, they are not from forum viewers but from podcast listeners, so the questioners are not usually from a formal scientific background. The site aims to generate an interest in science rather than present it as impenetrable, so many of the questions are from a very basic understanding of the topic, often from popsci articles (as @Halc pointed out), and the listener is unlikely to be versed in the subtleties of scientific terminology. So a good reply will try to answer the question at the level of the questioner with more details in any followup discussion.
Some of the questions are followed up in later programmes, and some of the responses are put on the main podcast/articles site.
As evan said, the questioners are notified and directed here and some do register to ask follow up questions if they found the answer helpful.

10

General Science / Re: history assignment help

« on: 20/12/2021 08:21:18 »

Sorry mate, but all spammers are history on this forum

11

Physics, Astronomy & Cosmology / Re: How long does a gravitational wave last?

« on: 24/11/2021 08:46:33 »

@Harri
I’ve changed the title of your question from gravity wave to gravitational wave.
A gravity wave is one that uses gravity as the returning force eg water waves.

12

The Environment / Re: Should we conserve for a Single Species or Habitat

« on: 18/11/2021 06:30:54 »

I help look after a Trust reserve where Hazel Dormice have been reintroduced. There is Hazel coppice, that is degrading as time goes on.

Which group is running this reintroduction? I assume PTES who have been releasing. They ought to be aware of the importance of habitat management for dormice.
Have you spoken to the mammal society? https://www.mammal.org.uk/species-hub/full-species-hub/discover-mammals/species-hazel-dormouse/
It might be worth contacting researchers in this field eg https://www.researchgate.net/publication/326126680_Habitat_preferences_of_hazel_dormice_Muscardinus_avellanarius_and_the_effects_of_tree-felling_on_their_movement
Who are part of this team https://wildlifescience.org/portfolio/dormouse-conservation/
This document outlines the importance of hazel coppicing and tree cover management https://ptes.org/wp-content/uploads/2014/06/Dormouse-Conservation-Handbook.pdf

I can’t give specific advice as this isn’t my field, but if you have problems finding the right people I have a personal interest in conservation and can ask around my contacts.

13

General Science / Re: Matter is Apparently Made of Fields, But How the Heck does that Work?!

« on: 16/11/2021 00:07:45 »

Soooo... fields, as I've described them in my question don't actually exist and are just an easy way to describe how something in the physical world works and behaves?

They don’t exist in the way you think about them, but what they measure and model are real enough.
Temperature exists, wind exists, the effect of what we call a magnetic field exists.
The last one is a really good example. We define a magnetic field by the force and direction of that force (vector) on a test magnet at a particular point. The force on the magnet is very real, it’s effect is one we can feel. The field is how we describe it.
This field does exist in all space, because in theory the field from one fridge magnet goes out to infinity, although it would be so small as to be impossible to measure it even at a few meters. So now you need to ask a question, does the field cause the magnet or does the magnet cause the field. Field theory doesn’t care, it just describes and predicts the behaviour of things affected by the magnetic field - there you see, our limited language forces us to attribute action to the field 
Not everything is cut and dried, as @Halc says current view is that particle & antiparticle are described by the same field, but we might find something in the future that changes that.

14

Just Chat! / Re: test

« on: 13/11/2021 14:40:59 »

Geeze!!  I was testing how to download a picture.  The test was a success, but I deleted the picture.  Now move along and let this meaningless post move down the list of unread posts until it disappears into the aether.

There is no aether 

15

New Theories / Re: Does man's use of energy in the last 200 years mean global warming is man-made?

« on: 13/11/2021 08:58:42 »

Ps - I did not quite understand the reference towards tryin to be
 " BRITISH " .
I Strongly Object Racism.
(Are you trying to be a Racist?)

Is it racist to mention a general characteristic of a nation or group? Not sure whether we do talk about the weather more than other nations, but we have a lot to talk about in the local weather:
https://www.sciencefocus.com/nature/why-do-the-british-talk-about-the-weather-so-much/
https://www.rabbies.com/en/blog/why-british-always-talk-about-weather

16

Physics, Astronomy & Cosmology / Re: A particle in 2 places at once?

« on: 05/11/2021 22:45:25 »

You seem to me to be be saying or implying that ,if measurements were finer and more efficient that the position and the momentum of a particle could be determined separately and not as a pair that are joined at the  hip

No, I’m not saying that, as Alan has explained very clearly.
What I’m saying is that the analogy @Harri was giving is inappropriate. There are two factors at work here, one is our state of knowledge of a particle because we can’t see it in the same way as looking at a player on a field. We see the player on the field because photons bounce off him and hit our eyes, those photons don’t move him or alter his momentum significantly, but they do if the player is an electron. One way we can detect an electron is to have it hit a detector eg phosphor screen, but then it’s stopped moving. Even if we use a speed gun on the player s/he has to move in order to get a doppler reading. These are the physical and practical problems.
The second problem is answered by Alan.
Reread Alan’s reply https://www.thenakedscientists.com/forum/index.php?topic=83459.msg659621#msg659621
There is an intrinsic limit to how accurately we can know these 2 properties at the same time and is quite different from the measurement problems already described. This is a limit set by the way the universe works. Reread both posts by Alan as he has put down very clearly what is an endless source of confusion to most non physicists, and unfortunately a few physicists!
For a large object like a ball kicked by a player the difference is so small that it is irrelevant around 10^-30m.

17

Physics, Astronomy & Cosmology / Re: A particle in 2 places at once?

« on: 31/10/2021 23:25:30 »

I often read that particles can be in two separate locations at once.

This has certainly never been demonstrated, and while not denying it, I am unaware of a quantum interpretation which goes to far as to assert this.

I’m not aware of one either. I think this is a misinterpretation of the solution to some wave equations where there is equal probability of 2 or even 4 solutions; that doesn’t mean those solutions exist simultaneously.

It is when I read that 'a particle' can be in two separate locations at once I wonder if the statement is true and if it is at all helpful to describe it as such when discussing superposition?

A cat being in superposition of dead and alive is not the same as saying it is both dead and alive. I think that's the disconnect not spelled out well in statements that word it otherwise.

Agreed, it’s a common misunderstanding of the Schrödinger’s thought experiment.

18

General Science / Re: How to reach orbit from dehradun

« on: 26/10/2021 12:55:44 »

(Let's just Forgive & Forget & move on...bcoz they certainly do not know, what they are doin)

Agreed, let's leave this thread as quickly as the OP left.
Must have got a rocket from somewhere 
Thus is the fate of returning trolls 

19

Physiology & Medicine / Re: SuperBug?

« on: 24/10/2021 18:55:29 »

👷
(Helmets/Headgear should be made Compulsory for All Mods)
🤞
Tc!

Thick skins are issued as standard 

20

New Theories / Re: Coronavirus will get weaker and then what?

« on: 22/10/2021 09:48:22 »

All women need to be impregnated immediately by men who show natural resistance to the lethal covid disease,

As women have a stronger immune response than men and men are more likely to die from covid, it may be the other way round. Look for the women who had very few symptoms?