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To start calculating the energy of a photon, you need to convert its frequency from terahertz (THz) to hertz (Hz). This is straightforward because 1 THz equals 1 trillion hertz. Mathematically, it means 1 THz is equal to \(1 \times 10^{12} \) Hz. Understanding this conversion is crucial since most physics equations and energy calculations require frequency to be in hertz.

The energy of a photon is given by the equation \( E = h u \), where \( E \) is energy, \( h \) is the Planck constant (\(6.62607015 \times 10^{-34}\) Js), and \( u \) is the frequency in hertz. For a photon with a frequency of 1 THz (or \(1 \times 10^{12}\) Hz), the energy in joules is calculated as follows:
\[ E = (6.62607015 \times 10^{-34}) \times (1 \times 10^{12}) = 6.62607015 \times 10^{-22} \text{ J} \]
This tells us how much energy this particular photon carries in joules.

Often, energy calculations in photonics and quantum mechanics are done in electron-volts (eV) instead of joules. The conversion factor is \(1 \text{ eV} = 1.602176634 \times 10^{-19} \text{ J}\). To convert the energy of a 1 THz photon from joules to electron-volts:
\[ E_{\text{eV}} = \frac{6.62607015 \times 10^{-22}}{1.602176634 \times 10^{-19}} \approx 4.14 \times 10^{-3} \text{ eV} \]
This value tells us that the photon's energy is quite small when expressed in electron-volts.

At room temperature, the average kinetic energy of an electron can be found using the formula \( \frac{3}{2} k_B T \), where \( k_B \) is the Boltzmann constant (\(1.380649 \times 10^{-23}\) J/K) and \( T \) is the temperature in Kelvin (K). At room temperature (300 K), this becomes:
\[ E_{\text{kin}} = \frac{3}{2} (1.380649 \times 10^{-23}) (300) \approx 6.21 \times 10^{-21} \text{ J} \]
Converting this kinetic energy to eV, we get:
\[ E_{\text{kin,eV}} = \frac{6.21 \times 10^{-21}}{1.602176634 \times 10^{-19}} \approx 0.0388 \text{ eV} \]
The kinetic energy of an electron at room temperature is significantly higher than the energy of a 1 THz photon.

Quantum effects refer to phenomena that occur at the quantum level, such as energy quantization, uncertainty principle, and wave-particle duality. Given the energy of a 1 THz photon (\(4.14 \times 10^{-3} \text{ eV}\)) is much smaller than the average kinetic energy of an electron at room temperature (0.0388 eV), it suggests that thermal energy dominates at room temperature. Thus, for a 1 THz photon, quantum effects may not be significant at room temperature since thermal energy masks its contributions.
In summary, low-energy photons, such as those at 1 THz, are often overshadowed by thermal energy at common temperatures, reducing the noticeable impact of quantum effects in such scenarios.