9.5 Review #1

Doppler effect is the change in the observed _______ of a wave when there is _________ motion between the source and the observer.

• frequency, relative

• frequency, straight

• wavelength, relative

• wavelength, straight

Choose what is INCORRECT about doppler effect when acceleration is zero.

• source is moving at constant speed.

• observer is moving at constant speed.

• source or observer can be stationary

• intensity increases if the distance is shorter

• Frequency is changing when a source is approaching at a constant speed

Choose what is INCORRECT describing the picture.

• u_s is moving with variable speed

• u_s is moving with constant speed

• u_o is stationary

• wavelength perceived λ' is shorter than source's λ

Choose what is INCORRECT describing the picture.

• ƒ' < ƒ (distance is getting shorter)

• ƒ' > ƒ (distance is getting shorter)

• Speed of sound v = speed of the wave perceived v'

• λ' < λ

Choose the correct perceived wavelength λ'.

distance traveled by source = u_s•T

• λ' = λ – u_s•T

• λ' = λ + u_s•T

• λ' = u_s•T

• λ' = λ

Source moving towards the observer.

Choose the correct description for ƒ'

• 
  

  $ƒ'=ƒ\left(\frac{v}{v+u_s}\right)$

• $ƒ'=ƒ\left(\frac{v}{v-u_s}\right)$

• $ƒ'=ƒ\left(\frac{v+u_o}{v}\right)$
  

• $ƒ'=ƒ\left(\frac{v-u_o}{v}\right)$
  

Source moving away from the observer.

Choose what is INCORRECT.

• ƒ' < ƒ

• λ' > λ

• v = v'

• Frequency is decreasing every second

• Intensity is decreasing every meter

Source moving away from the observer.

Choose the correct description for λ'

• λ' = λ + u_s•T

• λ' = λ

• λ' = λ – u_s•T

• λ' = u_s•T

Source moving away from the observer.

Choose the correct description for ƒ'

• 
  

  $ƒ'=ƒ\left(\frac{v}{v+u_s}\right)$

• $ƒ'=ƒ\left(\frac{v}{v-u_s}\right)$

• $ƒ'=ƒ\left(\frac{v+u_o}{v}\right)$
  

• $ƒ'=ƒ\left(\frac{v-u_o}{v}\right)$
  

The observer is moving towards the stationary source.

Find the INCORRECT option about this scenario.

• v = v'

• λ = λ'

• v' = u_o + v

• ƒ' > ƒ