A68.0 cm pvc pipe is open on both ends. use the speed of sound as 340 m/s. a draw snapshot graphs for the first five standing wave modes (graphs of pressure vs. position along the pipe). for each, label the nodes and antinodes and the distance that corresponds to the wavelength. b. use these drawings to determine the numerical value for the wavelength of each mode. c. calculate the frequency for each standing wave move. d. imagine that the one end of the 68.0 cm pvc is now closed. for each of the following quantities, identify whether it would increase, decrease, or stay the same. explain. a. wavespeed increase decrease stay the same b. wavelength increase decrease stay the same c. frequency increase decrease stay the same explain your reasoning: e someone plays the same pvc pipe, and a frequency of 1,375 hz is heard. was the pipe played the open-open condition or the open-closed conditions? how can you tell?

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weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.