26. Given graph (for a projectile motion) shows variation<br />of vertical velocity (y-component of vector) with<br />time. Then the maximum height of projectile is<br />[g = 10 m/s2]<br />Vy (m/s)<br />1<br />→ t(s)<br />0<br />(1) 10 m<br />(3) 5 m<br />(2) 20 m<br />(4) Data is insufficient<br />ole i proiected with yolocity 10 m/s at an

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

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.

the answer is 12 as i may remember

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