Is the speed of light photons always constant?

Yes, but only in a vacuum.
No, it depends on the facility.
A speed of light is always constant.
None of the above
The speed at which light propagates through transparent materials, such as glass or air, is less than c. However, this "slowing of the light" is only due to the fact of photos being absorbed and re-emitted after a slight delay between atoms. When a photon is emitted, it's speed is always c. In exotic materials like Bose–Einstein condensates near absolute zero, the effective speed of light may be only a few metres per second.
I know
-1
Correct this question
4
Very interesting!
reach: rather globallightphysicsspacewater
Light quizWater quizSpace quiz
  You will play as

Answers by country

Yes, but only in a vacuum.
No, it depends on the facility.
A speed of light is always constant.
None of the above
answers
flagRepublic of Ireland
8%
8%
83%
0%
12
flagLebanon
5%
17%
70%
5%
17
flagthe Philippines
25%
5%
65%
5%
20
flagAustralia
8%
11%
61%
17%
34
flagthe Netherlands
13%
13%
60%
13%
15
flagthe United States
24%
13%
55%
6%
161
flagCanada
44%
4%
52%
0%
25
flagSingapore
33%
8%
50%
8%
12
flagIndia
34%
14%
42%
6%
283
flagGreece
18%
25%
37%
12%
16
flagPoland
28%
27%
36%
7%
5394
flagPakistan
28%
14%
35%
14%
14
flagNigeria
17%
26%
34%
17%
23
flagthe United Kingdom
44%
17%
29%
8%
86
flagGermany
24%
33%
28%
13%
45