The energy of infrared waves is greater than that of  

Options

A. visible light
B. ultraviolet waves
C. X-rays
D. microwaves

Explanation

To determine which type of wave has energy less than that of infrared waves, we can use the relationship between energy and frequency. The energy \( E \) of electromagnetic waves is given by the formula:

\[ E = h \nu \]

where:
- \( E \) is the energy,
- \( h \) is Planck's constant (\(6.626 \times 10^{-34} \, \text{Js}\)),
- \( \nu \) is the frequency of the wave.

### Step-by-Step Solution:

1. **Identify the Frequency Range of Infrared Waves**:
- Infrared waves typically have frequencies ranging from \( 10^{12} \) Hz to \( 10^{14} \) Hz.

2. **Identify the Frequency Ranges of Other Waves**:
- **Visible Light**: \( 10^{14} \) Hz to \( 10^{15} \) Hz
- **Ultraviolet Waves**: \( 8 \times 10^{14} \) Hz to \( 3 \times 10^{16} \) Hz
- **X-Rays**: \( 10^{17} \) Hz to \( 10^{20} \) Hz
- **Microwaves**: \( 10^{9} \) Hz to \( 10^{12} \) Hz

3. **Compare Frequencies**:
- **Visible Light**: Frequencies are greater than infrared, hence energy is greater.
- **Ultraviolet Waves**: Frequencies are greater than infrared, hence energy is greater.
- **X-Rays**: Frequencies are greater than infrared, hence energy is greater.
- **Microwaves**: Frequencies are less than infrared (up to \( 10^{12} \) Hz), hence energy is less.

4. **Conclusion**:
- The energy of infrared waves is greater than that of microwaves because the frequency of microwaves is lower than that of infrared waves.

### Final Answer:
The energy of infrared waves is greater than that of microwaves.

---