8.The waves are observed by a child sitting in a rowboat off

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8.The waves are observed by a child sitting in a rowboat offshore.Which of the following properties of the waves seen by the child would be greater when the boat is moving away from the beach than when the boat is stationary with respect to the beach?
I.Speed of the waves with respect to the boat
II.Frequency at which the boat encounters successive wave crests
III.Distance between adjacent wave crests
(A) I only
(B) III only
(C) I and II only
(D) II and III only
(E) I,II,and III
19.Which of the following may transmit energy from one point to another?
I.Electromagnetic radiation
II.Sound waves
III.Convection currents
(A) I only
(B) III only
(C) I and II only
(D) II and III only
(E) I,II,and III

8.
首先离岸的船碰到wave的frequency肯定比静止的要高啊,因此II要选
然后是那个公式速度(v)=频率(f)*波长(λ),既然波长不变,频率increase,那速度也increase嘛,因此I也要选
船在离岸和wave之间的间隔没有关系啊,distance是wave自身的,所以III不选...
19.
Electromagnetic radiation很好说,微波炉就是这个嘛~肯定传送能量的...
Sound wave,看音叉就知道啦,两个摆一起,一个震动另一个也会震动的,也transmit energy
Convenction current是对流,你想想热水加到冷水里,肯定有energy传送啊~
所以全选!

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