When an object is moving towards you and emitting sound waves, will the observed frequency be higher or lower?*1 pointhigherlower

Fill in the blanks. Choose from the following words, some may be used more than once, others not at all: Doppler, shift, higher, frequency, lower, relative, absolute, reflections, refractions, blood, water, ultrasound, infrasound, movement If a sound source is moving relative to an observer, the sound appears to undergo a change in . If the source is approaching an observer then they will perceive the sound to have a frequency than when it was emitted at the source. The opposite is also true, with a sound from a receding source perceived to be in frequency. This phenomenon of apparent change is called the effect. The change in frequency itself is called the Doppler . The magnitude of the Doppler shift depends on the speed of the source towards or away from the observer. The Doppler effect also applies to of sound off a moving interface. The Doppler effect can be used with to detect and measure the of anatomical structures within the body. For example, the rate of flow through arteries and veins, or through the heart can be measured. The ultrasound beam is reflected off cellular components in the blood, and the observed shift is used to determine the rate of blood flow along the line of sight.

A source moves towards a stationary observer with a speed of 20m/s. If the frequency of the source is 100Hz and speed of sound is 330m/s, determine the apparent frequency heard by observer(ii) Determine the wavelength of sound heard by the observer in part a.108.5Hz;  3.55mb.108.5Hz; 2:10 mc.104.5Hz; 3.10 md.96.45Hz; 3.55me.106.45Hz; 3.10mf.104.5Hz; 3.67 m

A car is travelling at a constant velocity directly towards a man standing in the middle of the road.The driver sounds the car’s horn as a warning. The horn emits a sound wave of constantfrequency.The frequency of the sound heard by the man is different from the frequency of the sound emittedby the horn.Which statement is correct?A The frequency of the sound emitted by the horn is greater than the frequency of the soundheard by the man.B The frequency of the sound heard by the man depends on the distance between the car andthe man.C The sound waves continually accelerate as they move from the horn to the man.D The wavelength of the sound heard by the man is less than the wavelength of the soundemitted by the horn.

Longitudinal waves of frequency more than the audible range of humans is called

Sound frequency is measured in