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Assertion (A): In India, electricity distribution companies calculate the consumption of electricity in kWh. Reason (R): Electrical system in India works at a frequency of 60 Hz.
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appearance of colour in thin films is due to ____________________?
What is the difference between a CFL and an LED Lamp? 1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material. 2. The average life span of a CFL is much longer than of an LED lamp. 3. A CFL is less energy efficient as compared to an LED lamp. Which of the statements given above is/are correct?