Quiz #2 Sound and Light

1. 1. Sound is produced by vibration of molecules. Which medium does sound travels fastest?

• Solid

• Liquid

• Gas

• Space

2. Which of the following is transmitted when sound travels from one medium to another?

• air

• density

• energy

• molecules

3. Which of the following has the greatest effect on sound in air?

• amplitude

• frequency

• temperature

• wavelength

4. 4. Which of the following is important for the propagation of sound?

• distance

• medium

• light

• space

5. 5. Why does sound travel faster in wood than in water?

• There are more molecules in wood than in water.

• The molecules in wood are bigger compared to the molecules in water.

• The molecules in water collide randomly, hence sound can easily be transmitted.

• The molecules in wood are tightly packed against each other, hence sound can be propagated easily.

6. 6. Which of the following is the classification of sound wave?

• Electromagnetic Wave

• Longitudinal Wave

• Transverse Wave

• Shock Wave

7. 7. Which of the following describes the change in direction of sound waves around corners?

• diffraction

• refraction

• reflection

• interference

8. 8. How do nocturnal animals such as bats find their food source even at night?

• flapping

• echo location

• radar

• sonar

9. 9. If the temperature is -10^oC, what is the speed of sound?

• 735 m/s

• 625 m/s

• 535 m/s

• 325 m/s

10. 10. Why does sound travel faster at high temperatures?

• Because there are more molecules in the hotter surrounding.

• Because the molecules of air become tightly packed.

• Because air molecules have more energy and vibrate faster at a higher temperature.

• Because sound is louder at higher temperatures.