Question

REVIEW QUESTIONS I. As the frequency of electromagnetic radiation decreases, 6. A photon has a wavelength of 3 × 10-12 m. what is its wavelength will: a. increase. b. decrease. c. remain the same. d. frequency and wavelength are unrelated frequency? a. 3 x 104 Hz b. 3 X 100 Hz c. 1 x 10- Hz d. 1 X 1030 Hz g members of the electromagnetic7. Which of the following do not originate from an unstable spectrum has the ability to ionize matter? a. Radiowaves b. X-rays c. Microwaves d. Ultraviolet light nucleus? a. Alpha particles b. Beta particles c. X-rays d. Gamma rays 3. Which of the following is not within the wavelength range 8. How much activity will remain in a dose of 20 mCIaTC of electromagnetic radiation? a. 10-4 after 24 hours? (The physical half-life ofTc is 6 hours.) a. 5 mCi b. 10-12 c. 10 d. 10-6 b. 10 mCi c. 0.05 mCi d. 1.25 mC 4. Which me of the electromagnetic spectrum has the 9. The intensity of a source at 15 inches is 10 R. What will longest waragth? a. Micre b. Visibl:cat c. Radiowaves d. X-rars the intensity be at 45 inches? b. 0.74 R С. 90R d. 304 R . A diag tic s ray photon has a frequency of 2.42 X 10"10. The intensiy of a source is25at 40inches What will Hz. Wia ts its wavelength? the intensity be at 20 inches? a. 6.25 R b. 62.5 R c. 100 R c. 1.2 3-11 m] d. 12m d. 1000 R

Answer 1

Answer 1. We know that in electromagnetic spectrum the wavelength of electomaelectro radiation is inversely proportional to the frequency of elcelectromagne radiation. And we also know the relation f = c/lembda

Therefore frequency of electromagnetic radiation decreases then wavelength increases.

So, option (a) is the correct answer.

2. Ionisation radiation is radiation with enough energy so that during the Interaction with atom they have enough energy to remove tightly bound electron from the orbitnof atom.

This requires very light energy so all electromagnetic radiation are not ionizing only those which carry very high energy is ionizing. So, X-ray is ionizing radiation.

So, option (b) is correct answer.