Get Answers to all your Questions

header-bg qa

An earthquake generates both transverse (S) and longitudinal (P) sound waves in the earth. The speed of S Wave is about 8 \mathrm{~km} / \mathrm{s} and that of P waves is about 16 \mathrm{~km} / \mathrm{s}. A seismograph records P and s waves from an earthquake. The first P wave arrives 14 \text min before the first S wave. The epicentre of the earthquake is located at a distance (in \mathrm{km} ) of about

Option: 1

12340 Km


Option: 2

13340 Km


Option: 3

14340 Km


Option: 4

15340 Km


Answers (1)

best_answer

d=v_1 t_1=v_2 t_2

Here V_1=8 \mathrm{~km} / \mathrm{s} and V_2=16 \mathrm{~km} / \mathrm{s}

\therefore \quad 8 t_1=16 t_2 \\

t_1=2 t_2 \\                         -------------(1)

and  \quad t_1-t_2=14 \mathrm{~min} \\

t_1-t_2=840 \mathrm{sec}     --------------(2)

2 t_2-t_2=840 \\                     [using (1)]

t_2=840 \mathrm{sec}

Put in eq (1) we get

f_1=2 \times 840 \\

d_1=1680 \mathrm{sec} \\

d = {(8 km/s)1680}

d =13340 Km

Posted by

Divya Prakash Singh

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE