G8/9 MIDTERM

Sonic boom is the sound generated by an object travels through air faster than the speed of sound in air. The speed is

• 250 km/h

• Mach 1

• 200 km/h

• Mach 0.5

As energy in a wave INCREASES, the WAVELENGTH ___________.

• Increases

• Decreases

• Does not change

• Inconsistent

Which type of interaction is shown in the image?

• Destructive Interference

• Absorption

• Constructive Interference

• Reflection

These waves have the same

• amplitude
• frequency
• period 
• wavelength

What is different between these two waves?

• Amplitude

• Frequency

• Wavelength

• Nothing is different between them.

The speed of a wave is 50 m/s. It's frequency is 31,25 Hz. What is the wavelength of the wave?

• 1.6 m

• 2 m

• 2.4 m

• 4 m

Velocity= _________

Wavelength= 4.2 m

Frequency= 70 Hz

• 156 m/s

• 176 m/s

• 254 m/s

• 294 m/s

If a wave has a wavelength of 3 m and a frequency of 100 Hz, what is its speed?

• 300 m/s

• 150 m/s

• 600 m/s

Sound waves travel faster in solids than in gases (e.g. air)

• TRUE

• FALSE

A carpet salesperson uses an ultrasonic device to measure the length of a room. The device shows that the distance from one wall to the opposite wall is 6.5 m. If the speed of ultrasound in air is 340 m/s, how long does it take for the ultrasound to travel to the far wall and back again?

• 0.019 s

• 0.038 s

• 4420 s