CSIR Physical Sciences: Questions 356 - 358 of 401

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Question number: 356

» Electronics and Experimental Methods » Opto-Electronic Devices » Solar Cells

Appeared in Year: 2011

MCQ▾

Question

Monochromatic light of wavelength 660nm and intensity 100mWcm2 falls on a solar cell of area 30cm2 . The conversion efficiency of the solar cell is 10%. If each converted photon results in an electron – hole pair, what is the maximum circuit current supplied by the solar cell?

(Take h=6.6×1034Js , c=3×108ms and e=1.6×1019C ) (December)

Choices

Choice (4) Response

a.

320mA

b.

3200mA

c.

1600mA

d.

160mA

Question number: 357

» Classical Mechanics » Lagrangian and Hamiltonian Formalism and Equations of Motion

Appeared in Year: 2011

MCQ▾

Question

The Hamiltonian of a particle of unit mass moving in the XY – plane is given to be:

H=xPxyPy12x2+12y2 in suitable units. The initial values are given to be (x(0),y(0))=(1, 1) and (Px(0),Py(0))=(12,12) . During the motion, the curves traced out by the particles in the xy – plane and the PxPy plane are (June)

Choices

Choice (4) Response

a.

both hyperbolas

b.

both straight lines

c.

a hyperbola and an ellipse, respectively

d.

a straight line and a hyperbola respectively

Question number: 358

» Classical Mechanics » Special Theory of Relativity » Mass-Energy Equivalence

Appeared in Year: 2011

MCQ▾

Question

An atom of mass M can be excited to a state of mass M+Δ by photon capture. The frequency of a photon which can cause this transition is – (December)

Choices

Choice (4) Response

a.

Δ(Δ+2M)c22Mh

b.

Δc22h

c.

Δc2h

d.

Δ2c22Mh

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