Echoes in Physics

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Quiz on sound and echoes for grade 9.

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Dew Physics

United Arab Emirates

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Echoes in Physics


Echoes in PhysicsVersion en ligne Quiz on sound and echoes for grade 9. par Dew Physics 1 What speed does sound travel at sea level in air (approx)? a 1500 m/s b 343 m/s c 100 m/s d 50 m/s 2 An echo is heard 3.0 s after the sound is produced. How far away is the reflecting surface? a about 515 m b about 3 m c about 150 m d about 1000 m 3 Which property of sound changes when distance to the wall increases? a Speed of sound in air b Frequency c Time delay of the echo d Wavelength 4 In a quiet room, which factor most affects echo clarity? a Surface smoothness and distance b Brightness of the room c Color of the walls d Humidity only 5 What does an echo require to be heard? a A moving observer b A high temperature c Only a single sound d Two sound events: production and reflection 6 If the distance to the wall doubles, the echo arrives how later? a Twice as late b Same time c Four times later d Half as late 7 Which unit measures sound intensity best? a Pascal (Pa) b Decibel (dB) c Watt (W) d Meter (m) 8 What happens to the frequency of the echo compared to the original sound? a It remains the same b It doubles c It increases randomly d It halves 9 Which material is most likely to produce a clear echo? a Absorbent foam b Soft carpet c Hard, smooth surface d Thin plastic wrap 10 Why does sound speed vary with temperature? a Sound is faster at night b It doesn't vary with temperature c Only humidity matters d Air density and elasticity change

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Echoes in Physics

Test

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Echoes in PhysicsVersion en ligne

par Dew Physics

What speed does sound travel at sea level in air (approx)?

An echo is heard 3.0 s after the sound is produced. How far away is the reflecting surface?

Which property of sound changes when distance to the wall increases?

In a quiet room, which factor most affects echo clarity?

What does an echo require to be heard?

If the distance to the wall doubles, the echo arrives how later?

Which unit measures sound intensity best?

What happens to the frequency of the echo compared to the original sound?

Which material is most likely to produce a clear echo?

Why does sound speed vary with temperature?