Answer: A hot lightbulb gave off white visible light instead of ultraviolet light.
Explanation:
Calculated weight (by experimentally) of Earth is 5.972 × 10²⁴ N
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Answer:
D = 230.2 Km
Explanation:
let distance between seismograph and focus of quake is D
From time distance formula we can calculate the time taken by the S wave

From time distance formula we can calculate the time taken by the P wave

It is given in equation both waves are seperated from each other by 17.8 sec
so we have
sec
Putting both time value to get distance value

D = 230.2 Km