Homework Help: Physics

Posted by Jon on Friday, April 11, 2008 at 4:14pm.

1)Which of the following statements about X rays is incorrect?

A)x rays darken photographic plates
B)x rays can penetrate soft body tissue
C)the kinetic energy of high speed electrons is converted to x rays when they collide with matter.
D)x rays can easily penetrate bones and any thick material

I got D

2)An electromagnetic wave has a frequency of 2.90 x 10^14 Hz. What is the wavelength of the wave?

3.00 x 10^8/2.90 x 10^14
= 1.03 x 10^-6 m

Physics - bobpursley, Friday, April 11, 2008 at 6:30pm
yes, on both.
- (right hand rules list) please read - Jon, Friday, April 11, 2008 at 6:55pm
  Fist right-hand rule: is a method you can use to determine the direction of a magnetic field relative to the direction of conventional current.
  
  Second right-hand rule: is a method you can use to determine the direction of the field produced by an electromagnet relative to the flow of conventional current.
  
  Third right hand rule: the direction of the force on a current-carrying wire in a magnetic field can be found by this rule.
  
  Fourth right-hand rule: to find the force on the charges in the wire use this rule

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