An electromagnetic wave has a frequency of 3.0 x 105 hz. what is the
wavelength of the wave? use the equation 2 = and the speed of light as 3.0
x 108 m/s.
o a. 9.0 x 103 m
o b. 9.0x1013 m
o c. 1.0 x 103 m
o d. 1.0 x 1013 m

Option C is correct !!

Wavelength = 1.0× 10³ m

Explanation:

• Speed of light = Speed of Electromagnetic waves in Vaccum !!

[ Refer to the attached file ]

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards