Question

Which of the following are the correct postulates of the quantum theory of light?
(A). Each photon of frequency v has the energy hv, the same as Planck’s energy.
(B). The higher v, the greater the photon energy hv.
(C). Blue color has lower energy than green color.
(D). Changing the intensity of the incident light beam will change the frequency v of the photon.
Choose the correct answer from the options given below:

• A. (A), (B), and (C) only
• B. (A), (B), and (D) only
• C. (A) and (B) only
• D. (A) and (D) only

Hint:

The energy of the photon is given by E=hv where h is planck’s constant and v is the frequency. The frequency is not dependent on the intensity of light, which is why higher frequency light such as blue light has more energy than red light.

Answer 1

The Correct Option is C

The quantum theory of light states that light consists of discrete energy packets known as photons.
• Photon energy: The energy of a photon, E=hv, is directly related to its frequency (v), where h represents Planck’s constant.
• Frequency-energy relationship: Photon energy (E) is directly proportional to its frequency (v); thus, increased frequency correlates with higher photon energy.
• Color-frequency correlation: Blue light possesses a higher frequency and, consequently, greater energy than green light.
• Intensity-frequency distinction: Modifying light intensity alters the number of photons but does not influence the frequency of individual photons.
Therefore, options A and B are accurate.