494 reputation
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bio website none.seriously
location Switzerland
age 30
visits member for 2 years, 6 months
seen Jun 26 at 13:27

Physicist.


Sep
18
comment Ultrasound during pregnancy
I sure hope so - I wouldn't go as far as distrusting an actual doctor who claimed this, since it's a Physics detail that shouldn't taint the diagnosis, but still I'd be very careful with someone who claims false facts instead of simply admitting to not knowing for sure...
Sep
13
comment Ultrasound during pregnancy
Radiation?! Ultrasound is sound is a pressure wave, while radiation means actual particles (including, but not limited to, light consisting of photons. I know you didn't write that yourself, but still this requires emphasis - ultrasound is not radiation
Apr
9
comment Why do plants have green leaves and not red?
@David only if the absorbed energy weren't used efficiently, which would, as you suggest, be a reason for leaves to be not black. You could also have green but inefficient and therefore hot leaves, but evolution would have gotten rid of these already
Jan
16
comment Why do plants have green leaves and not red?
good point. Maybe in most cases absorbing green was just the first thing that happened (by evolution) and it was sufficient, but I'm just speculating...
Jan
11
comment Why do plants have green leaves and not red?
nice links, though I doubt black plants are likely to happen anywhere since that would most likely need too many different pigments
Jan
9
comment How does a veggie-less diet affect the human body?
@ThePlan: well that renders my answer useless...
Jan
9
comment How does a veggie-less diet affect the human body?
You mean something like the Anti-Vegetarian?
Jan
5
comment Why do plants have green leaves and not red?
@AlexanderGalkin: True, but that should already be included in the red curve (together with atmospheric absorption): for blue you can see a stronger deviation from sunlight (yellow curve) than for red/IR (Unfortunately I don't have the dataset but it would be better visible for the photon density)
Jan
4
comment Why do plants have green leaves and not red?
@MartaCz-C: I think that's because of the solar spectrum, and as you said water absorbs red light stronger so at deep sea levels red light becomes more and more unusable and can the red-absorbing pigments can then be dropped in favour of green absorbers
Jan
4
comment Why do plants have green leaves and not red?
I think the solar spectrum is also quite relevant.
Jan
4
comment Why do plants have green leaves and not red?
@AdamZalcman: There's probably no organic substance with this absorption spectrum, and adding further pigments to cover the entire VIS spectrum might not pay off.