posted by Jon .
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
yes, on both.
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