Modern physics quiz

Hello dear students, print the document and present it in class.

Thank you

Please be clear and well-organized in all your steps.

1. Gold has a work function of 4.83 eV.

(a) What is the value of the threshold frequency? I.e., what is the lowest frequency for electromagnetic radiation incident on a gold surface if photoelectrons are to be emitted in the photoelectric effect? Answer ___________

(b) Now suppose that ultraviolet light with a wavelength of 150 nm shines on a gold surface. What is the stopping potential? I.e., what is the potential of the collector relative to the emitter which will barely prevent electrons from making it to the collector and producing a current? Answer ___________

2. Our Sun has a surface temperature of about 6000 K. A particular blue giant has a surface temperature of 30,000 K. And a particular red dwarf has a surface temperature of 3000 K.

(a) For each of these stars, determine λmax , the wavelength at the peak in the plot of intensity versus wavelength. Sun ______________ blue giant _____________ red dwarf _____________

Retroalimentación, cinemática y dinámica

Favor de imprimir de la siguiente liga:

https://physics.info/motion-graphs/practice.shtml

saludos

Course of kinematics and dynamics, textile engineering

Very appreciable students of textile engineering

Solve the following problems (as completely as possible): 

1. The graph below shows velocity as a function of time for some unknown object.
   
   1. What can we say about the motion of this object?
   2. Plot the corresponding graph of acceleration as a function of time.
   3. Plot the corresponding graph of displacement as a function of time.
2. Sketch the displacement-time, velocity-time, and acceleration-time graphs for…
1. an object moving with constant velocity. (Let the initial displacement be zero.)
2. an object moving with constant acceleration. (Let the initial displacement and velocity be zero.)

send it next March 14, to the email: jose.gogu@outlook.com

Very successful, I see you next week

Curso de cinemática y dinámica

Compañeros, buen día...

realizar el siguiente ejercicio:

Un conductor de karts que se encuentra en reposo comienza a acelerar alcanzando en 12 s una velocidad de 64.8 km/h. Sabiendo que la aceleración es constante en todo momento, completa la siguiente tabla:

t(s)	0	2	4	8	10	12
v(m/s)
s(m)
a(m/s2)

y dibujar las graficas v-t, s-t y a-t.

saludos cordiales