An Electron in an Atom Drops from an Energy Level

question 22

Multiple Choice

An electron in an atom drops from an energy level at -1.1 *10^-18 J to an energy level at -2.4* 10^-18 J.The wave associated with the emitted photon has a frequency of:

• A)2.0 * 10¹⁷ Hz
• B)2.0 *10¹⁵ Hz
• C)2.0 * 10¹³ Hz
• D)2.0 * 10¹¹ Hz
• E)2.0 *10⁹ Hz

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Definitions:

Thermal Expansion

The increase in volume of a substance due to a rise in temperature.

Electronic Overload Unit

A protective device that monitors the current to motors and disconnects power in case of overload, preventing damage.

Overload Unit Contacts

Components within an overload relay that open or close electrical circuits to provide motor protection against excessive current.

Motor Starter Contactor

An electromechanical switch used to control the power supply to a motor, providing safe start and stop operations.