An echo returned in 0.5 s. If speed of sound is 340 m/s, the distance of reflecting surface is MCQ with Answer and Explanation

Explanation:
According to Archimedes' principle, the floating ice displaces a volume of water equal to its own weight. When the ice melts, it transforms into a volume of water that is exactly equal to the volume of water it displaced while floating. Therefore, the water level remains unchanged.

Explanation:
s = ½ a t² => 30 = ½ a (4) => a = 15 m/s².

Explanation:
Seismograph records earth tremors, detects earthquakes. Barometer atmospheric pressure. Hygrometer humidity. Anemometer wind speed. Seismograph uses inertia of a suspended mass.