Sound and Echolocation

What is the wave equation that relates the speed, frequency and wavelength of a sound wave?

• Speed = frequency + wavelength
• Speed = frequency × wavelength
• Speed = frequency ÷ wavelength
• Speed = frequency − wavelength

What is the formula that relates the period and frequency of a sound wave?

• Period = frequency + 1
• Period = frequency × 1
• Period = frequency ÷ 1
• Period = 1 ÷ frequency

What is the unit of frequency?

• Hertz (Hz)
• Metre (m)
• Second (s)
• Newton (N)

What is the unit of period?

• Hertz (Hz)
• Metre (m)
• Second (s)
• Newton (N)

What is the speed of sound in air (approximately)?

• 330 m/s
• 3300 m/s
• 33000 m/s
• 330000 m/s

A sound wave has a frequency of 500 Hz and a wavelength of 0.66 m. What is its speed?

• 0.0013 m/s
• 0.75 m/s
• 330 m/s
• 759000 m/s

A sound wave has a speed of 1480 m/s and a wavelength of 0.74 m. What is its frequency?

• 0.0005 Hz
• 2 Hz
• 500 Hz
• 2000 Hz

A sound wave has a speed of 1480 m/s and a frequency of 50 kHz. What is its wavelength?

• 0.03m
• 0.074m
• 33.8m
• 74m

A sonar system sends an ultrasound pulse towards the seabed and detects it after 0.2 s. If the speed of sound in water is 1480 m/s, what is the depth of water?

• 37m
• 74m
• 148m
• 296m

A bat emits an ultrasound pulse and detects 0.01s later after reflecting from an insect. If the speed of sound in air is 330 m/s, how far away is the insect from the bat?

• 1.65m
• 3.3m
• 6.6m
• 13.2m