Bandgap energy in LED semiconducting material is normally in the visible region. i.e. 380nm to 760nm.
61) Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
Answer is:
visible rays
Explanation:
Related General Physics MCQ with Answers
Answer is:
Moment of inertia and moment of a force
Explanation:
Moment of inertia (I) = mr2 = (mass * length * length) = ML2 Moment of force (TORQUE) = I * angular acceleration)= M L3 T(-2)
Answer is:
mercury has greater visibility than water
Explanation:
If water were used instead of mercury, the height of the column required would be very large. The density of mercury being much more than that of water, it expands lesser and thus can be used in manageable tubes. There is nothing limiting us from using water instead of mercury except the height of the tube.
Answer is:
total internal reflection
Explanation:
Optical fibre works on total internal reflection.
Answer is:
4.20years
Explanation:
Alpha centauri is 4.37 light years from the Sun & after sun alpha centauri is nearest from the earth.