Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Waves

Question:

Which of the following statements is NOT true about X-rays?

Options:

Wavelength Range: 100 Å - 0.1 Å

Frequency range: 1011 Hz - 1014 Hz

Source: sudden deceralation of fast moving electrons by a metal target

More energetic than UV rays

Correct Answer:

Frequency range: 1011 Hz - 1014 Hz

Explanation:

Incorrect statement:

☀ Frequency range: $10^{11}\ \text{Hz} - 10^{14}\ \text{Hz}$

Explanation:

The actual frequency range of X-rays is approximately $10^{16}\ \text{Hz}$ to $10^{20}\ \text{Hz}$.

Hence, the given frequency range is NOT true.