Select True or False for the following statements. A wire carries a steady curre
ID: 2094999 • Letter: S
Question
Select True or False for the following statements. A wire carries a steady current i=I0. As a result of this current, no electromagnetic radiation is emitted from the wire. Sunlight perpendicularly strikes two surfaces of equal area. One surface is a perfect absorber and the other surface is a perfect reflector. The force exerted by the sunlight on the absorbing surface is twice the size of the force exerted by the sunlight on the reflecting surface. The speed of electromagnetic waves in vacuum is not proportional to their wavelength.Explanation / Answer
1)false
Q = I^2R and this heat produced will produce electromagnetic radiation
2)true
the change in momentum of a photon for a reflector will ve 2v as ( v - [-v]) if v is the velocity of approach and retrreat of a photon as the photon gets reflected back
as compared to that of an absorber where it is only v as the photon gets absorbed
force = change in momentum
as for the reflector the change in momentum is twice as large thus the force will be twice as large
3)true
th espeed of electromagnetic waves is independent of the medium in which they travel and is equal to the speed of light