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Irina18 [472]
4 years ago
11

Researchers have found that the ________ lobes of the brain are more active when we experience positive emotions, while the ____

____ lobes of the brain are more active when we experience negative emotions.
Physics
1 answer:
seropon [69]4 years ago
5 0
Hello!:

Answer:

<span>Researchers have found that the left frontal lobes of the brain are more active when we experience positive emotions, while the right frontal lobes of the brain are more active when we experience negative emotions.

The frontal lobe of the brain has some functions such: movement control,  behavior control, high-level mental functions and emotion control. </span>
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Newton did not discover gravity, for early humans discovered that whenever they fell. what newton did discover is that gravity _
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Because of friction, rotational kinetic energy is not conserved while the disks' surfaces slip over each other. What is the fina
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4 0
3 years ago
Very short pulses of high-intensity laser beams are used to repair detached portions of the retina of the eye. The brief pulses
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Answer:

a) U = 0.375 mJ

b) p_rad = 4.08 mPa

c) λ_med = 604 nm  ; f_med = 3.7 * 10^14 Hz

d) E_o  = 3.04 * 10^4 V / m , B _o = 1.013 *10^-4 Nm/Amp  

Explanation:

Given:

λ_air : wavelength = 810 * 10^(-9) m

P: Power delivered  = 0.25 W

d : Diameter of circular spot = 0.00051 m

c : speed of light vacuum = 3 * 10^8 m/s

n_air : refraction Index of light in air = 1

n_med : refraction Index of light in medium = 1.34

ε_o : permittivity of free space = 8.85 * 10^-12 C / Vm

part a

The Energy delivered to retina per pulse given that laser pulses are 1.50 ms long:

U = P*t

U = (0.25 ) * (0.0015 )

U = 0.375 mJ

Answer : U = 0.375 mJ

part b

What average pressure would the pulse of the laser beam exert at normal incidence on a surface in air if the beam is fully absorbed?

                   

                                                p_rad = I / c

Where I : Intensity = P / A

                                                p_rad = P / A*c        

Where A : Area of circular spot = pi*d^2 / 4

                                               

                                                 p_rad = 4P / pi*d^2*c  

                              p_rad = 4(0.25) / pi*0.00051^2*(3.0 * 10^8)      

                                                 p_rad = 0.00408 Pa                          

Answer : p_rad = 4.08 mPa

part c

What are the wavelength and frequency of the laser light inside the vitreous humor of the eye?

                                    λ_med =  n_air*λ_air / n_med

                                     λ_med = (1) * (810 nm) / 1.34

                                           λ_med = 604 nm

                                               f_med = f_air

                                          f_med = c /  λ_air

                                 f_med = (3*10^8) / (810 * 10^-9)

                                          f_med = 3.7 * 10^14 Hz

Answer : λ_med = 604 nm  ; f_med = 3.7 * 10^14 Hz

d)

What is the electric and magnetic field amplitude in the laser beam?

                                        I = P / A

                                I  = 0.5*ε_o*c*E_o ^2

                                   I = 4P / pi*d^2

Hence,              E_o = ( 8 P /  ε_o*c*pi*d^2 ) ^ 0.5

E_o = ( 8 * 0.25 / (8.85*10^-12) * (3*10^8) * π * (0.00051)^2) ^ 0.5

                                 E_o  = 3.04 * 10^4 V / m

For maximum magnetic field strength:

                                      B_o = E_o / c

                         B_o = 3.04 * 10^4 / (3*10^8)

                         B _o = 1.013 *10^-4 Nm/Amp      

Answer: E_o  = 3.04 * 10^4 V / m , B _o = 1.013 *10^-4 Nm/Amp      

5 0
3 years ago
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