4. Diffraction of sound waves is much more evident than diffraction of visible l

Question

4. Diffraction of sound waves is much more evident than diffraction of visible light waves because A) sound waves have a lower velocity that visible light waves B) sound waves have a higher frequency than visible light waves c) sound waves have longer wavelengths than visible light waves d) sound waves are longitudinal and visible light waves are transverse 5. A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of 54.0 It is observed that the reflected beams of light form an angle of 93.0. What is the index of refraction of this material? a) 1.24 b) 1.84 c)1.54 d)1.38 e)1.49 6. The rms electric field from a radio station 9.5 km away is found to be 0.15 V/m. Assuming the radio station broadcasts uniformally in all directions, what is the power output of the station? a)48 kw b) 34 kw c)17 kw d)24 kw e) 68 kw 7. How far from a 50 mm focal length lens, such as is used in many 35 mm cameras must as object be positioned if it is to form a real image magnified in size by a factor of three? a) no real image can form b) 46 mm c) 52 mm d) 67 mm e) 58 mm

Explanation / Answer

4)(c)sound waves have longer wavelengths than visible lights

5)(a)1.24

from snell's law

n1 sin(theta1) = n2 sin(theta2)

n1 = 1 x sin93/sin54 = 1.24

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