Wave

From this picture determine the Periode and the Amplitude of the wave

• A=2 cm ; T = 6 s

• A=-2 cm ; T = 6 s

• A=6 cm ; T = 36 s

• A=2 cm ; T = 36 s

From these graphs, determine the speed of the wave

• 3 cm/s

• 3 m/s

• 6 m/s

• -2 cm/s

Equation of the wave can be written as

 $y=A\sin\left(\frac{2\pi}{\lambda}x-\frac{2\pi}{T}t\right)$  , Equation of wave from the graph is.

•  $y=2\sin\left(\frac{\pi}{18}x-\frac{\pi}{3}t\right)$  

•  $y=-2\sin\left(\frac{\pi}{8}x-\frac{\pi}{3}t\right)$  
  

•  $y=2\sin\left(\frac{\pi}{4}x-\frac{\pi}{6}t\right)$  

•  $y=2\sin\left(\frac{\pi}{3}x-\frac{\pi}{6}t\right)$  
  

Find the speed of the wave

• 20 cm/s

• 52.5 cm/s

• 62.5 cm/s

• 80 cm/s

At a distance of 15 m from the source, the intensity of a loud sound is

 $2.0×10^{-4}Wm^{-2}.$  
find the intensity at 120 m from the source

•  $3.0×10^{-6}Wm^{-2}.$  

•  $6.0×10^{-4}Wm^{-2}.$  

•  $2.0×10^{-3}Wm^{-2}.$  

•  $3.0×10^{-3}Wm^{-2}.$  

At a distance of 15 m from the source, the intensity of a loud sound is

 $2.0×10^{-4}Wm^{-2}.$  
if the Amplitude for this Intensity is A , The amplitude at 120 m from the source is...

• A/2

• A/8

• 4A

• 8A

• Ray, Spherical WaveFront, Plane Wavefront

• Spherical WaveFront, Ray, Plane Wavefront

• Amplitude, Ray, Wavefront

• Ray, Amplitude, Wavefront

• x1-x2

• x2-x1

• x1+x2

• A2+A1

Unpolarized light of intensity I is incident on the first of two polarizing sheets. Initially the planes of polarization of the sheets are perpendicular. Which sheet must be rotated and by what angle so that light of intensity I / 4 can emerge from the second sheet?

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• 
• 
• 

Unpolarized light in air is reflected from a liquid surface in such a way that it is completely polarized. The angle of incidence is 43°. What is the angle of refraction in the liquid?

• 53^o

• 51^o

• 47^o

• 43^o