University:
Boston University
Course:
CAS CH 101 | General Chemistry 1
Academic year:

2020
Views:

297

Pages:

2
Author:

Mattie Whitaker

1. FM radio station identifies itself as WBUR 90.9 FM. What is the frequency of the electromagnetic wave broadcast by this station? Light General Chemistry 2. FM radio station broadcasts at 90.0 MHz (90.9 x 106/s). What is the wavelength of its radio waves? 0% 0% 0% 0% 1. 2. 3. 4. 91 m 33 m 9.1 m 3.3 m 4. Orange light has a wavelength of about 600 nm and so frequency 5 x 1014/s. How many times a second does the electric field of light change direction? 0% 0% 0% 0% 1. 2. 3. 4. 1 x 1015/s 5 x 1014/s 1 x 1014/s 5 x 1013/s 0% 0% 0% 0% 1. 2. 3. 4. 90.9 Hz 90.0 x 106 Hz 90.0 x 1012 Hz 90.0 x 1018 Hz 3. Orange light has a wavelength of about 600 nm. What is the frequency of orange light? 0% 0% 0% 0% 1. 2. 3. 4. 1 x 1015/s 5 x 1014/s 1 x 1014/s 5 x 1013/s 5. The photoreceptor molecules in our eyes are approximately 30 Angstrom = 30 x 10‐8 cm wide. Orange light has a wavelength of about 600 nm. Compared to the photoreceptor width, the wavelength of orange light is … 0% 0% 0% 0% 1. 2. 3. 4. about the same size twice the size 20 times larger 200 times larger 1 6. The photoreceptor molecules in our eyes are approximately 30 Angstrom (30 x 10‐8 cm) wide. What frequency light has a comparable wavelength? 0% 0% 0% 0% 1. 2. 3. 4. 1019/s 1017/s 1015/s 1013/s 8. Why do we not “see” x‐ray light? 0% 1. The wavelength is too large to fit through the pupils of our eyes. 0% 2. The nuclei of the photoreceptors are too heavy. 0% 3. The electrons of the photoreceptors move too slowly. 0% 4. We are able to see x‐ray light. 7. What region of the spectrum is light of frequency 1017/s = 1017 Hz? 0% 0% 0% 0% 1. 2. 3. 4. Radio Microwave Visible X‐ray 9. Why do we not “see” microwave light? 0% 1. The wavelength is too large to fit through the pupils of our eyes. 0% 2. The electrons of the photoreceptors move too slowly. 0% 3. The electrons of the photoreceptors move too rapidly. 0% 4. None of the above. 2