(II) Any type of wave that reaches a boundary beyond which its speed is increased, there is a maximum incident angle if there is to be a transmitted refracted wave. This maximum incident angle θ iM corresponds to an angle of refraction equal to 90°. If θ i > θ iM , all the wave is reflected at the boundary and none is refracted, because this would correspond to sin θ r > 1 (where θ r is the angle of refraction), which is impossible. This phenomenon is referred to as total internal reflection. ( a ) Find a formula for θ iM using the law of refraction. Eq. 15–19. ( b ) How far from the bank should a trout fisherman stand (Fig. 15–38) so trout won’t be frightened by his voice (1.8 m above the ground)? The speed of sound is about 343 m/s in air and 1440 m/s in water.
(II) Any type of wave that reaches a boundary beyond which its speed is increased, there is a maximum incident angle if there is to be a transmitted refracted wave. This maximum incident angle θ iM corresponds to an angle of refraction equal to 90°. If θ i > θ iM , all the wave is reflected at the boundary and none is refracted, because this would correspond to sin θ r > 1 (where θ r is the angle of refraction), which is impossible. This phenomenon is referred to as total internal reflection. ( a ) Find a formula for θ iM using the law of refraction. Eq. 15–19. ( b ) How far from the bank should a trout fisherman stand (Fig. 15–38) so trout won’t be frightened by his voice (1.8 m above the ground)? The speed of sound is about 343 m/s in air and 1440 m/s in water.
(II) Any type of wave that reaches a boundary beyond which its speed is increased, there is a maximum incident angle if there is to be a transmitted refracted wave. This maximum incident angle θiM corresponds to an angle of refraction equal to 90°. If θi> θiM, all the wave is reflected at the boundary and none is refracted, because this would correspond to sin θr> 1 (where θr is the angle of refraction), which is impossible. This phenomenon is referred to as total internal reflection. (a) Find a formula for θiM using the law of refraction. Eq. 15–19. (b) How far from the bank should a trout fisherman stand (Fig. 15–38) so trout won’t be frightened by his voice (1.8 m above the ground)? The speed of sound is about 343 m/s in air and 1440 m/s in water.
ii)
The resultant intensity due to the destructive interference of two waves is 9 W/m2.
Evaluate the amplitude of each wave if the ratio of their amplitudes is 3/2.
(B) Calculate the intensity of a wave propagation with power of 20 KW. the area of the
cross section of the surface is 35X 10² M2. If the power had been changed in sequences
(30 KW, 40 KW, 45 KW) on same area represent by figures the relation between
intensity of wave with all points of powers?
ii)
The resultant intensity due to the destructive interference of two waves is 36 W/m.
Evaluate the amplitude of each wave if the ratio of their amplitudes is 1/4.
University Physics with Modern Physics (14th Edition)
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