Question

1 multiple choice 2 points a jet will create a sonic boom as it exceeds the speed of sound. jean watched a jet as it flew over her head and across the sky. the jet exceeded the speed of sound as it approached her. when did jean most likely hear the sonic boom? at the exact same time the jet passed overhead at the exact same time the jet exceeded the speed of sound after the jet had passed over her head and was moving away from her after the jet exceeded the speed of sound but before it passed over her head 2 multiple choice 2 points what happens to green light and red light when they shine on a green leaf? both are absorbed. both are reflected. green light is absorbed, and red light is reflected. green light is reflected, and red light is absorbed. 3 multiple choice 2 points as two trucks approach each other, the driver of one truck sounds his horn. compared to the true frequency of the horn when the trucks are stationary, the frequency heard by the other driver will be lower higher the same

Explanation:

1. For the first question:

• When a jet exceeds the speed of sound, the sonic boom is created. But the sound (sonic boom) travels at the speed of sound. The jet is moving faster than the speed of sound. So, when the jet has passed overhead and is moving away, the sonic boom (which was created when the jet was approaching) has enough time to reach Jean.

1. For the second question:

• A green leaf appears green because it reflects green light. It absorbs other colors like red light.

1. For the third question:

• According to the Doppler effect, when two objects (in this case, two trucks) are moving towards each other, the frequency of the sound (horn) heard by the observer (the other driver) is higher than the true frequency when the source (horn) and observer are stationary.

Answer:

1. after the jet had passed over her head and was moving away from her
2. Green light is reflected, and red light is absorbed.
3. higher