A major limitation of using photovoltaic cells to generate electricity is that they

Explained below:

Explanation:

The major limitation in the use of Photovoltaic cells to generate electricity is its unpredictability about the climate that whether it will be a shining day or a cloudy day and it does not work at night also because of no presence of sunlight as it totally depends on it. It can be used as an alternative but cannot be used as chief source of electricity.

you would expect a sound wave to speed up. - b)