Question

A sound wave emitted from a SONAR takes 9 s to be received back when emitted in an
ocean with depth Of 6.1 km. The speed of sound in the ocean water was:
a) 1665m/s
b) 1550m/s
c) 1356m/s
d) 1276m/s​

Answer 1

Answer:

\huge{\sf{Question}}Question

Two sides of a triangle are 5 and 7 cm longer than the third side. If the perimeter is 21cm, find the length of each side ?

\huge{\sf{Given:-}}Given:−

Let the third side be x

Then,

Length of first side = (x+5)cm

Length of second side = (x+7)cm

Length of third side = x cm

Perimeter = 21cm

\huge{\sf{Solution:-}}Solution:−

Perimeter of triangle = Sum of their sides

\longrightarrow⟶ \sf{(x+5+x+7+x)cm= 21cm}(x+5+x+7+x)cm=21cm

\longrightarrow⟶ \sf{(3x+12)cm = 21cm}(3x+12)cm=21cm

\longrightarrow⟶ \sf{3x=(21-12)cm}3x=(21−12)cm

\longrightarrow⟶ \sf{3x=9}3x=9

\longrightarrow⟶ \sf{x= \frac{9}{3}}x=39

\longrightarrow⟶ \sf{x=3}x=3

_______________________________

\sf{\red{Therefore,the\: sides\:are:-}}Therefore,thesidesare:−

First side = (3+5)=8cm

Second side = (3+7)=10cm

Third side = 3cm

Answer 2

Answer:

Answer is D.

SONAR is the best example that illustrates how a ship on the ocean utilizes the reflecting properties of sound waves to determine the depth of the ocean. A sound wave is transmitted and bounces off the seabed. Because the speed of sound is known and the time lapse between sending and receiving the sound can be measured, the distance from the ship to the bottom of the ocean can be determined. This technique is called sonar (SOund Navigation And Ranging).

SONAR is the best example that illustrates how a ship on the ocean utilizes the reflecting properties of sound waves to determine the depth of the ocean. A sound wave is transmitted and bounces off the seabed. Because the speed of sound is known and the time lapse between sending and receiving the sound can be measured, the distance from the ship to the bottom of the ocean can be determined. This technique is called sonar (SOund Navigation And Ranging).A common use of ultrasound is in SONAR. Ultrasonic waves are used in SONAR instead of audible sound waves.