During which phase of the hype cycle, developed by gartner inc., does interest wane as experiments and implementations fail to deliver on the hype of the peak?

Trough of disillusionment

Explanation:

The  five overlapping stages in a technology hype cycle  are:

Innovation Trigger : the possibility of technological breakthrough, implementation of the technology startsPeak of Inflated Expectations: success stories start to multiply, as well as failures, but nothing concrete. Trough of Disillusionment : If experiments and implementation continue to fail, interest wanes and producers tend to shake out or fail.Slope of Enlightenment : the potential benefits of the technological breakthrough start to multiply, other producers try to imitate the technology .Plateau of Productivity: technology starts to be adopted by the mainstream market

Disillusionment

Explanation:

Trough of Disillusionment: Interest wanes as experiments and implementations fail to deliver. Producers of the technology shake out or fail. Investments continue only if the surviving providers improve their products to the satisfaction of early adopters.

D. An angel investor (also known as a business angel, informal investor, angel funder, private investor, or seed investor) is an affluent individual who provides capital for a business start-up, usually in exchange for convertible debt or ownership equity.