Which outcome occurs, when a microwave oven operates with an empty cavity?

💡 Explanation

When a microwave operates empty, very little water is available to absorb microwave energy; this causes the microwaves to be reflected back to the magnetron, the microwave source, because almost none are absorbed. Therefore magnetron overheating occurs, rather than mode interference or arcing which require specific cavity conditions and loads.

• Which outcome occurs when the path length difference exceeds the coherence length in a Michelson interferometer?
• Which constraint diminishes holographic image reconstruction when using incoherent illumination?
• Which risk increases when spent nuclear fuel rods, submerged in a cooling pool, undergo cladding failure?
• Which outcome characterizes an intrinsic semiconductor's behavior near absolute zero?
• Which outcome arises when industrial salt-dissolving equipment experiences overheating?
• Which outcome occurs when piezoelectric actuators drive a MEMS capacitor beyond its designed frequency threshold?