Physics
Waves
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#41 The threshold of hearing for human ear is
A) \(10^{-12}\) W/m\(^2\)
B) \(10^{-10}\) W/m\(^2\)
C) \(10^{-8}\) W/m\(^2\)
D) \(10^{-6}\) W/m\(^2\)
#42 The sound level of a whisper is about
A) 10 dB
B) 20 dB
C) 30 dB
D) 40 dB
#43 The sound level of normal conversation is about
A) 40 dB
B) 60 dB
C) 80 dB
D) 100 dB
#44 The sound level of a jet engine at 30 m is about
A) 100 dB
B) 120 dB
C) 140 dB
D) 160 dB
#45 The phenomenon of bending of waves around obstacles is called
A) Reflection
B) Refraction
C) Diffraction
D) Interference
#46 The phenomenon of superposition of two waves to produce a resultant wave of greater, lower or the same amplitude is called
A) Reflection
B) Refraction
C) Diffraction
D) Interference
#47 The phenomenon of change in direction of waves when they pass from one medium to another is called
A) Reflection
B) Refraction
C) Diffraction
D) Interference
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