# Physics

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

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1. yes, on both.

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2. 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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posted by Jon

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