2926: Doppler Effect - Revision history

172.68.186.91: /* Explanation */

2024-08-19T15:40:13Z

‎Explanation

B for brain: /* Explanation */

2024-05-05T09:38:09Z

‎Explanation

172.70.160.173: /* Explanation */ punc

2024-05-02T10:15:48Z

‎Explanation: punc

172.71.178.219: /* Explanation */

2024-05-02T08:30:42Z

‎Explanation

172.71.242.43: /* Explanation */ Siren tones aren't usually steady - it's the predictable repeatability that matters.

2024-05-02T08:29:12Z

‎Explanation: Siren tones aren't usually steady - it's the predictable repeatability that matters.

172.71.178.184: /* Explanation */

2024-05-02T08:27:31Z

‎Explanation

141.101.98.164: /* Explanation */

2024-05-02T08:25:56Z

‎Explanation

141.101.98.164: /* Explanation */ Not sure it's true that that they ''usually'' have multiple tones

2024-05-02T08:24:44Z

‎Explanation: Not sure it's true that that they ''usually'' have multiple tones

172.70.160.145: /* Explanation */ it -> the source

2024-05-02T06:00:20Z

‎Explanation: it -> the source

172.70.160.173: Rolling back all to before the rogue capitals (essentially just the final I->i that was missed).

2024-05-01T15:48:14Z

Rolling back all to before the rogue capitals (essentially just the final I->i that was missed).

@@ Line 10: / Line 10: @@
 ==Explanation==
-[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w|redshift}} in the light from distant galaxies. She states that why this occurs is an interesting question, then follows this by talking about the {{w|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]].
+[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w|redshift}} in the light from distant galaxies. She states that why this occurs is an interesting question, then follows this by talking about the {{w|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]]. In [[1158: Rubber Sheet]], [[Beret Guy]] similarly subverts expectations of using a scenario as a common analogy to a scientific concept, when he is in fact enjoying it for its own sake.
 Different emergency vehicles may have different siren tones, and many have different tones on the same vehicle, which they can switch between for different circumstances, such as long NYEEEOOOWWW to alert people at a distance and short PYEEW PYEEW when they are closer to drivers, as for example when crossing an intersection.

← Older revision		Revision as of 09:38, 5 May 2024
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	==Explanation==		==Explanation==
−	~~{{incomplete\|Created by an ALARMED BOT THAT GOES NYOOOOM, updated by I AM NO SIREN EXPERT BUT... - Please change this comment when editing this page. Do NOT delete this tag too soon.}}~~
−
	[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w\|redshift}} in the light from distant galaxies. She states that why this occurs is an interesting question, then follows this by talking about the {{w\|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]].		[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w\|redshift}} in the light from distant galaxies. She states that why this occurs is an interesting question, then follows this by talking about the {{w\|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]].

@@ Line 20: / Line 20: @@
 Redshift is the same concept applied to wavelengths of light. Red has a longer wavelength than blue, so light-emitting objects get redder when they move away from us and bluer when they move toward us. We usually talk about redshift and not blueshift because while stars in our galaxy can move in any direction relative to us, most other galaxies are moving away from us. The fact that more distant galaxies are moving away quicker the farther away they are shows that the universe is expanding.
-Unlike the usual explanation of redshift as equivalent to the Doppler effect for sirens, a major component of the redshift of light from distant galaxies is due to the expansion of space in between us and the light source. This effect is not an important component of the Doppler shift for sirens{{cn}}. Redshift has been mentioned multiple times before, including in [[2764: Cosmological Nostalgia Content]] and [[2853: Redshift]].
+Unlike the usual explanation of redshift as equivalent to the Doppler effect for sirens, a major component of the redshift of light from distant galaxies is due to the expansion of space in between us and the light source. This effect is not an important component of the Doppler shift for sirens.{{Citation needed}} Redshift has been mentioned multiple times before, including in [[2764: Cosmological Nostalgia Content]] and [[2853: Redshift]].
 The title text claims that the Doppler effect particularly affects sirens. This isn't actually true, but it may seem like it because people hear Doppler shifts for sirens more than for other sounds. Sirens tend to employ predictable tone(s), which people who aren't {{w|Amusia|totally tone deaf}} would have experienced as a shift in pitch from a passing vehicle's siren, whereas something equally subject to Doppler shift like engine noise could also change pitch according to differences of speed and gearing. Then the text claims that the emoji for sirens is red because they're associated with redshift. Actually, the emoji is a picture of the rotating light on top of emergency vehicles; these tend to be used in conjunction with sirens, and they're red because this color typically signifies danger or warning (though, in fact, blue lights used with sirens are also common).

@@ Line 22: / Line 22: @@
 Unlike the usual explanation of redshift as equivalent to the Doppler effect for sirens, a major component of the redshift of light from distant galaxies is due to the expansion of space in between us and the light source. This effect is not an important component of the Doppler shift for sirens{{cn}}. Redshift has been mentioned multiple times before, including in [[2764: Cosmological Nostalgia Content]] and [[2853: Redshift]].
-The title text claims that the Doppler effect particularly affects sirens. This isn't actually true, but it may seem like it because people hear Doppler shifts for sirens more than for other sounds. Sirens tend to employ predictable tone(s), which people who aren't {{w|Amusia|totally tone deaf}} would have experienced as a shift in pitch from a passing vehicle's siren, whereas something equally subject to Doppler shift like engine noise could also change pitch according to differences of speed and gearing. Then the text claims that the emoji for sirens is red because they're associated with redshift. Actually, the emoji is a picture of the rotating light on top of emergency vehicles; these tend to be used in conjunction with sirens, and they're red because this color typically signifies danger or warning.
+The title text claims that the Doppler effect particularly affects sirens. This isn't actually true, but it may seem like it because people hear Doppler shifts for sirens more than for other sounds. Sirens tend to employ predictable tone(s), which people who aren't {{w|Amusia|totally tone deaf}} would have experienced as a shift in pitch from a passing vehicle's siren, whereas something equally subject to Doppler shift like engine noise could also change pitch according to differences of speed and gearing. Then the text claims that the emoji for sirens is red because they're associated with redshift. Actually, the emoji is a picture of the rotating light on top of emergency vehicles; these tend to be used in conjunction with sirens, and they're red because this color typically signifies danger or warning (though, in fact, blue lights used with sirens are also common).
 ==Transcript==

@@ Line 22: / Line 22: @@
 Unlike the usual explanation of redshift as equivalent to the Doppler effect for sirens, a major component of the redshift of light from distant galaxies is due to the expansion of space in between us and the light source. This effect is not an important component of the Doppler shift for sirens{{cn}}. Redshift has been mentioned multiple times before, including in [[2764: Cosmological Nostalgia Content]] and [[2853: Redshift]].
-The title text claims that the Doppler effect particularly affects sirens. This isn't actually true, but it may seem like it because people hear Doppler shifts for sirens more than for other sounds. Sirens tend to employ steady tone(s), which people who aren't {{w|Amusia|totally tone deaf}} would have experienced as a shift in pitch from a passing vehicle's siren, whereas something equally subject to Doppler shift like engine noise could also change pitch according to differences of speed and gearing. Then the text claims that the emoji for sirens is red because they're associated with redshift. Actually, the emoji is a picture of the rotating light on top of emergency vehicles; these tend to be used in conjunction with sirens, and they're red because this color typically signifies danger or warning.
+The title text claims that the Doppler effect particularly affects sirens. This isn't actually true, but it may seem like it because people hear Doppler shifts for sirens more than for other sounds. Sirens tend to employ predictable tone(s), which people who aren't {{w|Amusia|totally tone deaf}} would have experienced as a shift in pitch from a passing vehicle's siren, whereas something equally subject to Doppler shift like engine noise could also change pitch according to differences of speed and gearing. Then the text claims that the emoji for sirens is red because they're associated with redshift. Actually, the emoji is a picture of the rotating light on top of emergency vehicles; these tend to be used in conjunction with sirens, and they're red because this color typically signifies danger or warning.
 ==Transcript==

@@ Line 16: / Line 16: @@
 Different emergency vehicles may have different siren tones, and many have different tones on the same vehicle, which they can switch between for different circumstances, such as long NYEEEOOOWWW to alert people at a distance and short PYEEW PYEEW when they are closer to drivers, as for example when crossing an intersection.
-In the second and third panels, Miss Lenhart talks about the strange noise sirens (and cars) make when they pass you. The usual explanation of Doppler effect is that the source of the sound waves is moving and the wave can sound different depending on whether the source is coming towards you or away from you (for details/explanation see the {{w|Doppler effect}} in Wikipedia).
+In the second and third panels, Miss Lenhart talks about the strange change in perceived noise sirens (and cars) make when they pass you. The usual explanation of Doppler effect is that the source of the sound waves is moving and the wave can sound different depending on whether the source is coming towards you or away from you (for details/explanation see the {{w|Doppler effect}} in Wikipedia).
 Redshift is the same concept applied to wavelengths of light. Red has a longer wavelength than blue, so light-emitting objects get redder when they move away from us and bluer when they move toward us. We usually talk about redshift and not blueshift because while stars in our galaxy can move in any direction relative to us, most other galaxies are moving away from us. The fact that more distant galaxies are moving away quicker the farther away they are shows that the universe is expanding.

@@ Line 12: / Line 12: @@
 {{incomplete|Created by an ALARMED BOT THAT GOES NYOOOOM, updated by I AM NO SIREN EXPERT BUT... - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
-[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w|redshift}} in the light from distant galaxies. She states that why this occurs is an interestIng question, then follows this by talking about the {{w|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]].
+[[Miss Lenhart]] is teaching an astronomy class about the concept of {{w|redshift}} in the light from distant galaxies. She states that why this occurs is an interesting question, then follows this by talking about the {{w|Doppler effect}} of sirens. While sirens are commonly used as an example of the concept of the Doppler shift, and is hence relevant to the preceding topic, [[Miss Lenhart]] appears to have raised it for a completely unrelated purpose - she simply has a special interest in sirens. This becomes apparent as her explanation quickly veers away from the preceding topic, similarly to [[1519: Venus]], or due to a form of topical monomania similar to that which [[Hairbun]] exhibited in [[1610: Fire Ants]].
 Emergency vehicles usually have different siren tones, which they can switch between for different circumstances: long NYEEEOOOWWW to alert people at a distance and short PYEEW PYEEW when they are closer to drivers, as for example when crossing an intersection.