How are radar and an approaching siren alike? How are they different? A. Both use sound waves, but the Doppler effect can be observed
only with radar.

B. Both use sound waves, but the Doppler effect can be observed
only in the approaching siren.

C. Both exhibit the Doppler effect, but radar uses radio, and the siren
'uses sound waves.

D. Both exhibit the Doppler effect, but radar uses sound waves, and
the siren uses radio.

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

Describe the function of the endomembrane system? what organelles are involved?

Adisk with a radius of r is oriented with its normal unit vector at an angle q with respect to a uniform electric field. which of the following would result in an increase in the electric flux through the disk? check all that apply? a. increasing the area of the disk b. decreasing the given orientation angle of the disk c. decreasing the strength of the electric field d. increasing the given orientation angle of the disk, but not exceeding an angle of 90