7. Two photons are zooming across the Universe. One of them is an ultraviolet ph

Question

7. Two photons are zooming across the Universe. One of them is an ultraviolet photon, while the other is a microwave photon. Which has the greater speed?

a.) The ultraviolet since it has a higher energy

b.) The microwave since it has a longer wavelength.

c.) They have the same speed.

d.) You can’t figure that out with the information provided.

Part B.) . Which one of the following statements about atoms is false?

(a) Electrons have discrete energy levels.  

(b) Each element produces a unique pattern of spectral lines, like a fingerprint.

(c) Photon emission occurs randomly, in any direction.

(d) An electron in an atom may absorb either part or all of the energy of a photon.

(e) Absorption occurs when an electron in an atom jumps from a lower energy level to a higher energy level. (The Cosmos, 4th edition, question 38, p. 34).

Part C.) Which one of the following statements about electromagnetic waves is false?

(a) Human eyes are able to detect only a tiny fraction of all possible electromagnetic waves.

(b) If electromagnetic wave “A” has twice the wavelength of electromagnetic wave “B”, then “A” also has twice the frequency of “B”.

(c) "White light" such as sunlight actually consists of many electromagnetic waves, having different wavelengths, mixed together.

(d) An electromagnetic wave consists of oscillating electric and magnetic fields that are perpendicular to each other and perpendicular to the direction of motion.

(e) The measured speed of an electromagnetic wave is independent of the speed of its source relative to the observer. (The Cosmos, 4th edition, question 42, p. 34, slightly reworded)

Part D.) By observing the _________ of a star or planet, we can determine what kinds of atoms or molecules are present and their relative abundances. (The Cosmos, 4th edition, question 45, page 35). Place one or two words in the blank.

Part E.) Arrange the colors of the visible light spectrum in correct order by decreasing wavelength: ________, _________, _________, _________, _________, _________, and _________ (the color with the longest wavelength goes first).  

a.) The ultraviolet since it has a higher energy

b.) The microwave since it has a longer wavelength.

c.) They have the same speed.

d.) You can’t figure that out with the information provided.

Explanation / Answer

7. Both ultra violet and microwave are type of electromagnetic wave which travels with the speed of light and hence they both travel with the same velocity therfore option “c” is correct.

B. Option “b” is false statement as the unique spectra is known as line or atomic spectra.

C. The speed of light, wavelength of any wave and frequency of that wave is related as:

Speed of light = wavelength x frequency

And hence wavelength and frequency are inversely related therefore option “b” is false.

D. By observing the absorption spectra of a star or planet we can determine the type of atom or molecules it is composed of.

E. The components of light in decreasing wavelength are:

Red

Orange

Yellow

Green

Blue

Indico

Violet

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