A transmitter “encodes” or modulates messages by varying the amplitude or frequency of the wave – a bit like Morse code. At the other, a receiver tuned to the same wavelength picks up the signal and 'decodes' it back to the desired form
I think it’s A or D
The strength of chemical bonds would be the best answer to this question. Hardness is indirectly related to the strength of chemical bonds. Hardness is the resistance from the destruction of an object itself from a material. Hardness does not need to strength of chemical bonds in order to have this resistance.
Answer:

Explanation:
Energy consumed by 11 W energy efficient fluorescent bulb is given as

now we can say


now total cost of the energy used is given as


Now for conventional 40 W bulb we can say

now we can say


now total cost of the energy used is given as


So total money saving is given as

