If you substitute the expressions for ω1 and ω2 into Equation 9.1 and use the trigonometric identities cos(a+b) = cos(a)cos(b) - sin(a)sin(b) and cos(a-b) = cos(a)cos(b) + sin(a)sin(b), you can derive Equation 9.4. How does equation 9.4 differ from the equation of a simple harmonic oscillator? (see attached image) Group of answer choices A. The amplitude, Amod, is twice the amplitude of the simple harmonic oscillator, A. B. The amplitude is time dependent C. The oscillatory behavior is a function of the amplitude, A instead of the period, T. D. It does not differ from a simple harmonic oscillator.

Glencoe Physics: Principles and Problems, Student Edition
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Chapter16: Fundamentals Of Light
Section: Chapter Questions
Problem 77A
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If you substitute the expressions for ω1 and ω2 into Equation 9.1 and use the trigonometric identities cos(a+b) = cos(a)cos(b) - sin(a)sin(b) and cos(a-b) = cos(a)cos(b) + sin(a)sin(b), you can derive Equation 9.4.

How does equation 9.4 differ from the equation of a simple harmonic oscillator? (see attached image)

Group of answer choices

A. The amplitude, Amod, is twice the amplitude of the simple harmonic oscillator, A.

B. The amplitude is time dependent

C. The oscillatory behavior is a function of the amplitude, A instead of the period, T.

D. It does not differ from a simple harmonic oscillator.

V = 1 + 2
= A cos (w1 t) + A cos (wz t) ---- Equation 9.1
%3D
1
Wbeat
2
W1 = Way +
-
w2 = Wav
Wbeat
1
1
V = A cOS
Wav
Wbeat
+ A CoS
Wav
Wbeat
+
= A [{cos (Way t) cos
Wpeat t
sin (way t) sin
Wbeat
2
1
{cos (wav t) cos
Wbeat t
+ sin (way t) sin
Wbeat t}|
V = 2 A cos (wav t) cos
Wbeat
2
-
(금
1
Wbeat
2
Amod (t) = 2 A cos
= Amod (t) cos (Wav t)
Equation 9.4
-----
Transcribed Image Text:V = 1 + 2 = A cos (w1 t) + A cos (wz t) ---- Equation 9.1 %3D 1 Wbeat 2 W1 = Way + - w2 = Wav Wbeat 1 1 V = A cOS Wav Wbeat + A CoS Wav Wbeat + = A [{cos (Way t) cos Wpeat t sin (way t) sin Wbeat 2 1 {cos (wav t) cos Wbeat t + sin (way t) sin Wbeat t}| V = 2 A cos (wav t) cos Wbeat 2 - (금 1 Wbeat 2 Amod (t) = 2 A cos = Amod (t) cos (Wav t) Equation 9.4 -----
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