Which of the following statements is not correct ?

Options

A. Photographic plates are sensitive to infrared rays
B. Photographic plates are sensitive to ultraviolet rays
C. Infraed rays are invisible but can cast shadows like visible light
D. Infrared photons have more energy then photons of visible light

Answer

To determine which statement is not correct, we need to analyze each statement provided in the question.

1. **Photographic plates are sensitive to infrared rays.**
- Photographic plates are primarily sensitive to visible light and some ultraviolet light. They are generally not sensitive to infrared rays. This statement is likely incorrect.

2. **Photographic plates are sensitive to ultraviolet rays.**
- This statement is correct. Photographic plates can indeed be sensitive to ultraviolet rays.

3. **Infrared rays are invisible but can cause shadow.**
- This statement is correct. Infrared rays are indeed invisible to the human eye, but they can cause shadows, similar to visible light.

4. **Infrared rays are invisible but can cause shadow like visible light.**
- This statement is also correct. It reiterates the previous point about infrared rays being invisible yet capable of creating shadows.

5. **Infrared photons have more energy than photons of visible light.**
- This statement is incorrect. Infrared photons have less energy than photons of visible light. The energy of a photon is inversely proportional to its wavelength; since infrared has a longer wavelength than visible light, its photons have less energy.

6. **When we look at the energy spectrum, we see that the energy spectrum is visible, infrared, ultraviolet, x-ray, gamma ray.**
- This statement is correct. The electromagnetic spectrum includes visible light, infrared, ultraviolet, x-rays, and gamma rays.

### Conclusion:
The statements that are not correct are:
- "Photographic plates are sensitive to infrared rays."
- "Infrared photons have more energy than photons of visible light."

### Final Answer:
The statement that is not correct is: "Photographic plates are sensitive to infrared rays."