The frequency of x-rays, Y-rays and ultraviolet rays are respectively a, b and c Then

Options

A. a less than b, b greater than C
B. a greater than b, b greater than c
C. a greater than b,b less than c
D. a less than b, b less than c

Answer

To solve the problem regarding the frequencies of X-rays, Y-rays (Gamma rays), and ultraviolet rays, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Order of Frequencies**:
The electromagnetic spectrum lists different types of electromagnetic radiation in order of increasing frequency. The order is as follows:
- Radio waves
- Microwaves
- Infrared
- Visible light
- Ultraviolet rays
- X-rays
- Gamma rays

2. **Assign Variables**:
Let's assign the frequencies as follows:
- Frequency of X-rays = a
- Frequency of Gamma rays (Y-rays) = b
- Frequency of Ultraviolet rays = c

3. **Determine the Relationships**:
From the electromagnetic spectrum, we know that:
- Gamma rays have a higher frequency than X-rays.
- X-rays have a higher frequency than ultraviolet rays.

Therefore, we can write:
- \( b > a \) (Gamma rays have a higher frequency than X-rays)
- \( a > c \) (X-rays have a higher frequency than ultraviolet rays)

4. **Combine the Relationships**:
From the above relationships, we can combine them to get the overall order:
- \( b > a > c \)

5. **Conclusion**:
This means that the frequency of Gamma rays (b) is the highest, followed by X-rays (a), and then Ultraviolet rays (c).

### Final Answer:
Thus, the relationship between the frequencies is:
\[ b > a > c \]