Doppler blood flow unit emits ultrasound at 4.6 MHz. What is the frequency shift of the ultrasound reflected from blood moving in an artery at a speed of 0.18 m/s?   answer in Value and Units.

While sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 150 Hz (you have a very keen ear!). However, you know that ambulances have sirens that emit sound at 140 Hz. How fast is the ambulance approaching you, in m/s

Early Doppler shift experiments were conducted using a band playing music on a train. A trumpet player on a moving railroad flatcar plays a 320-Hz note. The sound waves heard by a stationary observer on a train platform hears a frequency of 350 Hz. What is the flatcar’s speed in mph? The temperature of the air is TC = 22°C .

A bat is flying 5.10 m/s is chasing an insect flying in the same direction. The bat emits a 39.9 kHz chirp and receives back an echo at 40.6 kHz. What is the speed of the insect ?

A sound wave represented by A = 0.0613 sin (2.81x - 978t). The density of air is 1.20 kg/m3. What is the maximum displacement of the air molecules? (b) What is the temperature of the air?

An ultrasound unit is being used to measure a patient’s heartbeat by combining the emitted 2.0 MHz signal with the sound waves reflected from the moving tissue of one point on the heart. The beat frequency between the two signals has a maximum value of 520 Hz. What is the maximum speed of the heart tissue?

A bat at rest sends out ultrasonic sound waves at 54.0 kHz and receives them returned from an object moving directly away from it at 33.0 m/s . What is the received sound frequency?

Hassan is driving his truck with a velocity of 18m/s towards a mountain. Kevin who is riding in the truck sounds a horn. The sound reflects from the cliff and is heard by Hassan and Kevin on the truck. What is the change in frequency in hertz if the horn had an initial wavelength of )=0.101 m? The temperature that day was 35 degrees celsius. (Speed of sound = 331+0.6 T(in celsius)). Please give your answer as a whole number.

Ultrasound of intensity 2.00 x 10-2 w/m2 is produced by the rectangular head of a medical imaging device measuring 3.00 cm by 6.05 cm. What is its power output?

Two sound waves arrive to an observer, the first is loud at 2 W/m ^2 and the second one is quieter at 100 mW/m^2 ; how many dB louder is the first one compared to the second one?