Checkpoint: loudness, pitch and hearing

A sound travels far from a speaker. The same energy spreads over a bigger area. What falls?

• The speed of sound
• The intensity
• The frequency

A bell makes 12 shakes in 4 s. What is its frequency?

• 8 Hz
• 48 Hz
• 3 Hz

A string has a frequency of 5 Hz. What is its time period?

• 0.5 s
• 5 s
• 0.2 s

Note A has a frequency of 200 Hz. Note B has 400 Hz. Which has the higher pitch?

• Note A
• Note B
• Both the same

A sound has a frequency of 25 000 Hz. What kind of sound is it?

• Ultrasound
• A sound you can hear
• Infrasound