Q. 134.4( 7 Votes )
Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.
Answer :
Boojho heard the sound of cracker after seeing the cracker because:
⇒ The speed of light is faster than sound.
Speed of sound in air = 330 m/s
Speed of light in air = 3 × 108 m/s
⇒ Thus, Boojho saw burst of cracker (light) first, then after some times, he heard the sound.
Rate this question :
Smart Revision | Lets Revise Sound43 mins
Quiz | Practice session( Sound )39 mins
NCERT | Sound Exemplar Part-148 mins
Lakhmir Singh | Part - 2 (Sound)37 mins
Quiz | Rapid Fire Round36 mins
How Human Ear Works?30 mins
NCERT | Lets Master Concepts of Sound46 mins
Smart Revision | Check your Understanding on Sound41 mins
Champ Quiz | Hearing of Sound28 mins
Rapid Fire Quiz on Sound39 mins
Explain why, if we strike a steel tumbler with a metal spoon lightly, we hear a feeble sound but if we hit the tumbler hard, a loud sound is heard.
Lakhmir Singh & Manjit Kaur - ScienceName any two common musical instruments and identify their vibrating parts.
Lakhmir Singh & Manjit Kaur - ScienceWhat type of pollution is caused by the working of mixer and grinder in the kitchen?
Lakhmir Singh & Manjit Kaur - ScienceGive two examples of each of the following :
(a) stringed musical instruments.
(b) wind musical instruments.
(c) membrane musical instruments.
(d) plate type musical instruments.
Lakhmir Singh & Manjit Kaur - ScienceName one musical instrument each in which the sound is produced:
(a) by vibrating a stretched string.
(b) by vibrating air enclosed in a tube.
(c) by vibrating a stretched membrane
(d) by vibrating metal plates.
Lakhmir Singh & Manjit Kaur - ScienceName the object (or part) which vibrates to produce sound in the following musical instruments :
(a) Sitar
(b) Dholak
(c) Flute
(d)Cymbals
(e) Veena
(f) Tabla
Lakhmir Singh & Manjit Kaur - ScienceOn what factor does the loudness of a sound depend?
Lakhmir Singh & Manjit Kaur - ScienceName two musical instruments which produce sound by vibrating strings?
NCERT - Science ExemplarBoojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.
NCERT - Science ExemplarHow does sound from a sound producing body travel through air to reach our ears?
Lakhmir Singh & Manjit Kaur - Science