Multiple Choice
What is the energy in kJ/mol of infrared radiation with a wavelength of 1.51 × 10⁻⁶ m?
9. Quantum Mechanics
The Energy of Light
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Which example involves the transformation of chemical energy directly into light energy?
A
A glow stick being activated
B
A car engine burning gasoline
C
Photosynthesis in plants
D
A battery powering a flashlight
Verified step by step guidance1
Identify the type of energy transformation involved in each example. Chemical energy is stored in the bonds of chemical compounds and can be transformed into other forms of energy.
Consider the glow stick being activated: This involves a chemical reaction where stored chemical energy is directly converted into light energy, a process known as chemiluminescence.
Analyze the car engine burning gasoline: This process converts chemical energy into mechanical energy and heat, not directly into light energy.
Examine photosynthesis in plants: This process converts light energy into chemical energy, which is the opposite of what the problem is asking for.
Look at a battery powering a flashlight: The chemical energy in the battery is first converted into electrical energy, which then powers the light bulb to produce light. This is an indirect transformation involving an intermediate step.
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