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Author Question: An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If ... (Read 128 times)

mia

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on: Jul 29, 2018
An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
 
  A) 2.2 cm in front of the mirror
  B) 2.2 cm behind the mirror
  C) 9.0 cm in front of the mirror
  D) 1.0 cm behind the mirror

Question 2

What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60  10-19 J, c = 3.00  108 m/s, h = 6.626  10-34 J  s)
 
  A) 417 nm
  B) 257 nm
  C) 344 nm
  D) 565 nm
  E) 610 nm


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yasmina

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

D


mia

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Reply 2 on: Jul 29, 2018
Wow, this really help

Liddy

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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