Laser Infrared
A common infrared laser operates at 1.03×103 nm. What is the energy of a photon with this wavelength?
a. 7.02×10-40 J
b. 6.25×10-28 J
c. 3.54×10-15 J
d. 1.92×10-19 J
e. 2.83×1014 J
I use the equation hc/λ= e but get 1.93*10(-28)
You have the correct relationship. You should have that h (Planck’s constant) = 6.626*10^-34 J*s, c = 2.998*10^8 m/s, and, in this case, λ = 1.03*10^-6 m, so:
E = (6.626*10^-34 J*s)*(2.998*10^8 m/s)/(1.03*10^-6 m)
E = 1.93*10^-19 J
The correct answer is (d), but the given answer is rounded incorrectly. Your answer is off by a factor of 10^9, which makes me think you might have confused nanometers (nm) with meters (m) in doing your calculation.
Mythbusters’ Infrared Laser
|
|
Maverick Laser Surface Thermometer $41.95 1 Second – Celsius, Fahrenheit Reading – Automatic On/Off, Backlit Digital Display – For Grill… |
|
|
Mastercool MSC52224A Non-Contact Infrared Thermometer with Laser $39.00 Infrared thermometer ranges from -58 to 932 degrees F, with large easy to read 1″ LCD display, scan mode, maximum temperature display, and F/C button. The unit includes 2 AAA batteries, instruction manual and a plastic molded carrying case…. |
|
|
Taylor Professional 9306 Dual Temp IR/Thermocouple Thermometer $81.45 Taylor precision waterproof dual temp thermocouple / thermometer the infrared temperature range is -67° to 626° f(-55° to 330° c) with one second response time. the thermocouple temperature range is -67° to 572° f(-55° to 250° c) with one second response time. model #: 9306 accurate to +/-1° f waterproof haccp check warning light system 4″ fold out probe step down probe carrying case and … |
|
|
HDE Temperature Gun Infrared Thermometer w/ Laser Sight $28.00 Available in red or yellow…. |
|
|
Kintrex IRT0421 Non-Contact Infrared Thermometer with Laser Targeting $44.95 The IRT0421 Non-Contact Infrared Thermometer with Laser is designed to accurately measure temperature from a distance. Simply pull the trigger and aim the pistol grip thermometer at an object using the laser indicator and the unit will provide an accurate temperature measurement in less than a second. The IRT0421 has an advanced highly accurate infrared sensor with a Distance to Spot Ratio of 12 t… |
August 29th, 2010 in
Laser in Amazon | tags: diy, electronics, hardware, infrared, laser, laser infrared, laser infrared illuminator, laser infrared mouse, laser infrared obs, laser infrared thermometer