Physics Dawn of Modern Physics ETEA 2015
PMDC Verified Question 50 of 52
Choose the correct relationship, when \( E \) = energy, \( h \) = plank's constant, \( c \) = velocity of light, \( f \) = frequency, \( \lambda \) = wavelength:
A
\( E = hfc \)
B
\( E = \frac{c}{\lambda} \)
C
\( E = \frac{n\lambda}{c} \)
D
\( E = hf \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( E = hf \)
Concept:

According to the quantum theory of light proposed by Max Planck, the energy of a single photon is directly proportional to its frequency.

Formula:

$$ E = hf $$

Solution:

  • The proportionality constant is Planck's constant, \( h \).


  • Thus, the definitive relationship linking energy and frequency is simply \( E = hf \).


Why other options are incorrect:

Multiplying by \( c \) or inverting the parameters results in equations that violate dimensional analysis. \( E = c/\lambda \) only gives frequency, not energy.

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