Author Question: If the absolute temperature of an object is doubled, the thermal power radiated per unit surface ... (Read 52 times)

frankwu · **on:** Jul 29, 2018

If the absolute temperature of an object is doubled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change)

A) increase by a factor of 2.
B) increase by a factor of 4.
C) increase by a factor of 8.
D) increase by a factor of 16.
E) increase by a factor of 32.

Question 2

What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state ni = 8 jumps to the final state nf = 2?

A) 205.1 nm
B) 104.0 nm
C) 388.8 nm
D) 486.2 nm
E) 610.0 nm