During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 3 108 m/s. a. E A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. N Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. C Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0°C 5 331.4 m/s) and the speed of sound in very warm air (vs at 40°C 5 355.4 m/s)?
During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 3 108 m/s. a. E A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. N Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. C Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0°C 5 331.4 m/s) and the speed of sound in very warm air (vs at 40°C 5 355.4 m/s)?
During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 3 108 m/s. a. E A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. N Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. C Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0°C 5 331.4 m/s) and the speed of sound in very warm air (vs at 40°C 5 355.4 m/s)?
. During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 3 108 m/s. a. E A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. N Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. C Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0°C 5 331.4 m/s) and the speed of sound in very warm air (vs at 40°C 5 355.4 m/s)?
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
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