Echo

Fill in the following blanks with suitable words: (a) An echo is simply a.........sound. (b) Pitch of sound depends on............. (c) Loudness of sound depends on........... (d) Quality of sound depends on......... (e) Echoes are caused by the ...............of sound.

A man fires a gun while standing between two parallel hills. If he hears the first echo after 2 s and the second echo 3 s after the first echo, then calculate the distance between the hills the velocity of sound is 330 m/s.

An echo repeats 5 syllables, each of which requires ⅕th of a second to pronounce and ½ second elapses between the time the last syllable is heard and the first syllable is echoed. Is echoed. Calculated the distance of the reflecting surface, the velocity of sound being 332 m//s .

A man fires a bullet standing between two cliffs. First echo is heard after 3 seconds and second echo is heard after 5 seconds. If the velocity of sound is 330 m/s , then the distance between the cliffs is

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. Do you hear echo sound on a hotter day ?

(a) What is an echo? How is echo formed? (b) What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20^(@)C) ? (c) A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 330m//s .

An engine blowing a whistle of frequency 133 Hz moves with a velocity of 60(m)/(s) towards a hiss from which an echo is heard. Calculate the frequency of the echo heard by the driver. (velocity of sound in air in 340(m)/(s) .)