130,542 reputation
8217358
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 2 months
seen 16 mins ago

Semi retired old time computer nerd who started programming on a Commodore Pet.

Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.


Mar
28
comment Why do we use microwaves in microwave oven?
@LightnessRacesinOrbit: I think your criticism is a bit unfair. Radio waves are indeed used for heating in induction furnaces. Well, the heating is magnetic not electrical, but frequencies up to 400kHz are used and that's into the radio range. Induction furnaces are extremely effective at heating food, but they tend to produce a lot of electrical interference.
Mar
28
reviewed Approve The concept of displacement in definition of work
Mar
28
comment How can matter reach the singularity of a black hole if time stops at the event horizon?
@QuantumForce: the key point is that in GR different observers can and do observe different things. That doesn't mean one is wrong and the other right - they are both right. For a Schwarzschild observer nothing can ever pass through the event horizon. For a free falling observer hitting the singularity takes a finite (usually very short!) time. The nothing can hit the singularity is conditionally true, and likewise conditionally false.
Mar
28
comment How can matter reach the singularity of a black hole if time stops at the event horizon?
@AlfredCentauri: a few weeks back. It's actually a bit of a pain because I have to remember that my duplicate vote will now immediately close a question tagged as GR, which isn't always what I want.
Mar
28
revised Acceleration due to Gravity: Free Fall
Typo and grammar
Mar
28
comment Laser tattoo removal
I take it back, I think there is some very interesting physics involved‌​!
Mar
28
comment Acceleration due to Gravity: Free Fall
Also related: Will free-fall object into black hole exceed speed of light c before hitting black hole surface? and Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?.
Mar
28
comment Acceleration due to Gravity: Free Fall
possible duplicate of Will an object always fall at an infinite speed in a black hole?
Mar
28
answered Rate of Dripping of tube
Mar
28
comment Laser tattoo removal
I'm voting to close this question as off-topic because it is not about physics
Mar
28
answered The concept of displacement in definition of work
Mar
28
answered Why do we use microwaves in microwave oven?
Mar
28
comment Why do we use microwaves in microwave oven?
Related: Why do microwave ovens use radiation with such long wavelength?, though it's not a duplicate as it doesn't specifically address the question of why we don't use visible light or IR.
Mar
28
comment How can matter reach the singularity of a black hole if time stops at the event horizon?
I've suggested what seems to me an obvious duplicate, and there are many other related posts on this site (though getting the right search terms to find them isn't trivial!). If you aren't happy that my suggested duplicate answers your question reply to this comment and I'll withdraw my clse vote.
Mar
28
comment How does one manipulate the frequency of alternating current?
This question belongs on the Electrical Engineering Stack Exchange
Mar
28
comment How to find the nature of an orbit knowing 2 altitudes and the time interval?
Hi Basu and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
Mar
28
reviewed Leave Closed Basic physics everyone should know
Mar
28
reviewed Looks OK Can we use the fermi surface concept for insulators?
Mar
28
reviewed Close Physics question on heat produced in resistance ckt
Mar
28
reviewed Leave Open Why is the sky of the moon always dark?