Homework Problem 1A.3


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Talia Dini - 3J
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Homework Problem 1A.3

Postby Talia Dini - 3J » Sat Oct 24, 2020 12:47 am

Hi, I'm having some trouble understanding part c of this problem. Can someone please explain what it means?

1A.3 Which of the following happens when the frequency of elec- tromagnetic radiation decreases? Explain your reasoning.
(a) The speed of the radiation decreases.
(b) The wavelength of the radiation decreases.
(c) The extent of the change in the electrical field at a given point decreases.
(d) The energy of the radiation increases.

LuveiaPangilinan 2C
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Re: Homework Problem 1A.3

Postby LuveiaPangilinan 2C » Sat Oct 24, 2020 8:59 am

The correct answer is C because em radiation is also known to be energy that going through space in a form similar to an em wave, the same thing as light. Therefore, because the formula E=hv shows that energy is proportional to the frequency, a decrease in frequency causes a decrease in energy as well.

Gerardo Ortega 2A
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Re: Homework Problem 1A.3

Postby Gerardo Ortega 2A » Sat Oct 24, 2020 10:48 am

Adding to the previous reply, another way of thinking about it is that the electromagnetic waves become wider when frequency decreases, thus making the peaks and troughs of the waves smaller.

Mansi Solanki 1K
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Re: Homework Problem 1A.3

Postby Mansi Solanki 1K » Sat Oct 24, 2020 11:06 am

The reason why (c) is the right answer is that the electric field corresponds with the amplitude, so as frequency decreases the waves broaden and the extent of change (slope of the curve) decreases.

Zoe Staggs 3B
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Re: Homework Problem 1A.3

Postby Zoe Staggs 3B » Sun Oct 25, 2020 9:39 pm

C is the correct answer because the "extend of change of the electric field" corresponds to the amplitude of the wave, which makes sense since the amplitude is essentially the extent the wave rises and falls.


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