1. Which of the following regions of the electromagnetic spectrum has the lowest

Question

1. Which of the following regions of the electromagnetic spectrum has the lowest frequency? a. X-ray b, gamma ray c, ultraviolet d, infrared e, visible 2. Which of the following statements isare CORRECT? FM radio waves have longer wavelengths than visible radiation and AM radio waves have shorter wavelengths than visible radiation. 2. Magnetic resonance imaging (MRI) uses a mixture ofx-rays and gamma rays. 3. Exposure to ultraviolet (UV) radiation can lead to sunburns. a. 1 only b. 2 only c. 3 only d. 1 and 2 e, 1,2, and 3 3.Adevice emits light at 244.4 nm. What is the frequency of this radiation? a. 1.23 x 10-3 Hz b. 3.69 x 10 6 Hz c. 1.23 x 1015 Hz d. 8.14 x 37 Hz e. 8.14 x 10-19 Hz. 4. A device emits light at 244.4 nm. What is the frequency of this radiation? a- 1.23 x 10 Hz b. 3.69 x 1026 Hz c. 1.23 x 15 Hz d. 8.14 x 10-37 Hz e. 8.14 x 10 19 Hz 5. Which type of experiment demonstrates that an electron has the properties of a wave? a. nuclear fission b. electron diffraction c. light emission from atomic gases d. mass spectroscopy e. photoelectric effect

Explanation / Answer

1) Radio waves have the lowest frequencies and longest wavelengths, while gamma waves have highest frequencies and shortest wavelengths.In this problem infrared wavelenght has the lowest frequency. option (d) is correct

2) Option (e) is correct

3) C = n

n = C/

n = (3 x 108 ) /(244.4 x 10-9) = 1.23 x 1015 Hz

4) Electron diffraction

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