T/F explain
1. water waves must change direction when they travel from a deep region to a shallow region
2. the speed of water waves decreases when travelling from a deep to a shallow region
3.when two incoherent sources are used to produce circular waves in a ripple tank, there is no observable interference pattern
4. when two sources are used to produce circular waves in a ripple tank, the sources must be coherent for interference to occur
phy wave
2015-01-05 12:40 am
回答 (3)
2015-01-05 3:18 am
✔ 最佳答案
1. F2. T
3. T
4. T
2015-01-07 19:54:06 補充：
Statement 1 is false because there is no change of direction when the wave travels normally to the boundary between deep and shallow water.
2015-01-07 19:56:06 補充：
Statemnet 2 is true because waves travelling in shallow water tend to encounter more resistance from the bottom of the water.
2015-01-07 19:57:42 補充：
Statement 3 and 4: For interference to occur, waves from the two sources must be coherent.
2015-01-08 5:48 am
1. F
If the angle of incidence of the water wave to the boundary between the deep region and the shallow region is 0 degree, angle of refraction is 0 degree, thus it's not a must.
2. T
(I forgot why)
3. T
A coherent source must be used in order to produce an observable interference pattern.
4. F
Interference ALWAYS occur when two waves meet. However, only coherent sources can produce an observable interference pattern.
2015-01-07 21:50:32 補充：
2. There are interactions between the water and its bottom. The shallower the water, the smaller its volume(generally), the more significant the interaction is.
2015-01-07 21:51:42 補充：
2. There are interactions between the water and its bottom. The shallower the water, the smaller its volume(generally), the more significant the interaction is.
2015-01-07 21:54:27 補充：
4. Interference is a unique property of waves. Anything that shows interference is wave. Incoherent waves are still waves and can still show interference
If the angle of incidence of the water wave to the boundary between the deep region and the shallow region is 0 degree, angle of refraction is 0 degree, thus it's not a must.
2. T
(I forgot why)
3. T
A coherent source must be used in order to produce an observable interference pattern.
4. F
Interference ALWAYS occur when two waves meet. However, only coherent sources can produce an observable interference pattern.
2015-01-07 21:50:32 補充：
2. There are interactions between the water and its bottom. The shallower the water, the smaller its volume(generally), the more significant the interaction is.
2015-01-07 21:51:42 補充：
2. There are interactions between the water and its bottom. The shallower the water, the smaller its volume(generally), the more significant the interaction is.
2015-01-07 21:54:27 補充：
4. Interference is a unique property of waves. Anything that shows interference is wave. Incoherent waves are still waves and can still show interference
參考: Me(S.5 Physics Student)
2015-01-05 3:33 am
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