# Speed of sound and light

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#1
Can someone just confirm this for me please. Is the speed of light 2.3x10^8ms-1 and sound 340.3ms-1 on Earth? If so, would we expect light (visual stimuli) to reach our eyes much faster than sound reaches our ears? So in essence we would see things before we hear them in terms of reaction times to visual and auditory stimuli).

Thank you
0
5 years ago
#2
(Original post by Sparkliest)
Can someone just confirm this for me please. Is the speed of light 2.3x10^8ms-1 and sound 340.3ms-1 on Earth? If so, would we expect light (visual stimuli) to reach our eyes much faster than sound reaches our ears? So in essence we would see things before we hear them in terms of reaction times to visual and auditory stimuli).

Thank you
Yes, this is also why you "see" lightning and then hear the "thunder".
0
5 years ago
#3
Were you not shown the old cricket ball and bat trick in school?

Teach stands a fair distance away, throws cricket ball in air and hits it. Due to the speed of light being faster, you see the bat connect with the ball and begin travelling, then you hear the noise moments after.
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#4
Yes, this is also why you "see" lightning and then hear the "thunder".

(Original post by A5ko)
Were you not shown the old cricket ball and bat trick in school?

Teach stands a fair distance away, throws cricket ball in air and hits it. Due to the speed of light being faster, you see the bat connect with the ball and begin travelling, then you hear the noise moments after.
Thank you both. Do you think it's relevant to add in a study which found that auditory stimuli reaction times were much faster than visual? (Which goes against the speed of light and sound)
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5 years ago
#5
(Original post by Sparkliest)
Thank you both. Do you think it's relevant to add in a study which found that auditory stimuli reaction times were much faster than visual? (Which goes against the speed of light and sound)
That's more to do with biology than physics
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5 years ago
#6
The speed of light is nearer 3 x 108 ms-1, not 2.3 x 108 ms-1
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5 years ago
#7
(Original post by Sparkliest)
Thank you both. Do you think it's relevant to add in a study which found that auditory stimuli reaction times were much faster than visual? (Which goes against the speed of light and sound)
It doesn't "go against" anything. The reaction times deal with what happens after you receive the stimulus. These speeds are about how long it takes to receive the stimulus from the source. You can't respond to a stimulus before you receive it. There may be an evolutionary reason why auditory reaction times have become faster than visual.
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