The unit of wavelength is:
  • Hertz
  • Metres
  • Seconds
  • Decibels
A man blows a whistle and hears the echo from a rock after 3.6 s. Speed of sound in air = 340 m/s. How far is he from the rock?
  • 612 m
  • 1224 m
  • 306 m
  • 680 m
A dolphin emits a 100 kHz click in seawater (speed = 1500 m/s). What is the wavelength?
  • 0.15 m
  • 0.015 m
  • 1.5 m
  • 15 m
A ship uses sonar; echo returns after 3 s. Speed = 1500 m/s. What is the water depth?
  • 225 m
  • 4500 m
  • 1500 m
  • 2250 m
A boy is standing 400 m away from a ship. Speed of sound in air = . How long does the sound take to reach him?
  • 1.18 s
  • 0.85 s
  • 2.35 s
  • 0.59 s
Speed of sound in steel could be:
  • 340 m/s
  • 1500 m/s
  • 5900 m/s
  • m/s
If frequency = and speed = , wavelength = ?
  • 0.34 m
  • 3.4 m
  • 34 m
  • 340 m
Time period of a wave with frequency is:
  • 0.2 s
  • 0.05 s
  • 0.02 s
  • 0.5 s
Wavelength of sound with frequency in air (speed ):
  • 0.59 m
  • 1.7 m
  • 3.4 m
  • 6.8 m
What is the frequency of a wave with time period :
  • 50 Hz
  • 500 Hz
  • 2000 Hz
  • 5000 Hz
If wavelength = and speed = , frequency = ?
  • 3000 Hz
  • 750 Hz
  • 1500 Hz
  • 500 Hz
A research vessel uses sonar to measure ocean depth. The onboard system shows the seabed is 450 meters below the ship. If the speed of sound in seawater is 1,530 m/s, how long will it take for the sonar pulse to travel to the seabed and return to the ship?
  • .0.294 s
  • 0.588 s
  • 1.176 s
  • 0.147 s
If amplitude doubles, what happens to loudness?
  • Doubles
  • Halves
  • Increases
  • Stays same
If frequency doubles, what happens to pitch?
  • Increases
  • Decreases
  • Stays same
  • Becomes ultrasound
Two sounds are produced with frequencies in the ratio 3:2. If they travel through the same medium (same speed), what is the ratio of their wavelengths?
  • A) 2:3
  • B) 3:2
  • C) 9:4
  • D) 4:9
A sound wave has a frequency of 500 Hz and travels at 340 m/s in air. If the same sound travels through water at 1500 m/s without changing frequency, what is the ratio of its wavelength in water to its wavelength in air?
  • A) 340∕1500
  • B) 1500/340
  • C) 500/340
  • D) 500/1500
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0