Electromagnetic Radiation with a Wavelength of 641 Nm Appears as Orange

question 20

Multiple Choice

Electromagnetic radiation with a wavelength of 641 nm appears as orange light to the human eye.The energy of one photon of this light is 3.10 × J.Thus,a laser that emits of energy in a pulse of light at this wavelength produces ________ photons in each pulse.

• A)2.4 ×
• B)6.3 × 10^-24
• C)2.7 ×
• D)4.2 ×
• E)6.5 ×

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Definitions:

PLC

Stands for Programmable Logic Controller, a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines.

CPU

The Central Processing Unit, which is the primary component of a computer responsible for interpreting and executing most of the commands from a computer's other hardware and software.

Ladder Logic

A programming language used to represent control logic in easily understood symbols arranged in a structure resembling a ladder, widely used in industrial and mechanical applications.

Scan

The process by which a PLC (Programmable Logic Controller) systematically checks its input signals and updates its outputs.