Question (one option correct type):
A beam of light passes through a hollow glass prism. Then,
A) the beam of light undergoes lesser but some dispersion compared to solid glass prism
B) the beam of light is totally internally reflected and does not come out through the opposite face
C) the beam of light does not undergo dispersion at all and comes out parallel to the incident ray
D) the beam of light undergoes angular deviation
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The explanation is provided in the short video embedded below.
A cockroach of mass m runs anticlockwise around the rim of a circular disc of radius R having moment of inertial I mounted on a frictionless vertical axis initially at rest. The speed of the cockroach with respect to the ground is v, whereas the disc turns clockwise with angular speed ω. The cockroach suddenly notices a bread crumb on the rim and, of course, stops immediately with respect to the disc. What is the angular speed of the disc after the cockroach stops?
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Why does the symbol c usually represent speed of light in vacuum? Choose the best possible option.
(A) Einstein used the symbol c first time in his equation $\displaystyle E=m{{c}^{2}}$
(B) Einstein used the symbol c first time in his equation $\displaystyle m=\frac{{{m}_{0}}}{\sqrt{1-\frac{{{v}^{2}}}{{{c}^{2}}}}}$
(C) c is the initial letter of the word celeritas, the Latin word meaning speed
(D) c is the initial letter of the word calculus
Question: In closed organ pipe, the sound gets reflected from the rigid boundary. This makes sense. But, in open organ pipe there is no boundary at the end. So, how can sound reflect?
Continue reading Open Organ Pipe Reflection Q & A