Complete the following statements: a) When a solid is heated, it emits electroma
ID: 515392 • Letter: C
Question
Complete the following statements: a) When a solid is heated, it emits electromagnetic radiation known as ______ An example of such radiation in the element of a stove stop burning bright red. A) isoelectric radiation B) visible and ultraviolet radiation D) paramagnetic radiation E) whitebody radiation b) Albert Einstein discovered that electrons are ejected from the surface metal when exposed to light at least a certain minimum frequency. The phenomenon is known as A) Aura Effect B) Photon Effect C) Ritzwald Effect D) Photoelectric Effect E) None of the answers is correct. c) Max Planck proposed that energy of radiation absorbed or emitted is composed of extremely small indivisible packages called Quanta. The theory is known as ______ A photon has an energy of 5.53 times 10^-17 J. What is its frequency in s^-1? [h = 6.63 times 10^-34 J s]. Infrared radiation from the sun has a wavelength of 6200 nm. Calculate the energy of one photon of that radiation (c = 3.0 times 10^8 m/s; h = 6.63 times 10^-34 J middot s). 4.1 times 10^-39 B) 4.1 times 10^-30 J C) 3.2 times 10^-29 J D) 3.2 times 10^-26 J E) between 10^-20 and 10^-19 JExplanation / Answer
a) Answer is C ( it emits over a wide range of wavelenths. so different colors )
b) Answer is D
c) Planck's quantum theory of radiation
1)
given energy = 5.53 *10-17 J
from planck's law E = h* f
where , h = planck's constant = 6.63 * 10-34 J-s
f = frequency (sec-1 )
E = energy ( J )
so, f = E/h = (5.53 *10-17 J ) / (6.63 * 10-34 J-s) = 8.34 *1016 sec-1
therefore, frequency is, 8.34 *1016 sec-1
2) given, wavelength = 6200nm = 6.2 * 10-6 m
from planck's law E = h* f
and c = frequecy * wavelength ; where c = light velocity = 3*108 m/sec
which gives, frequency = c / wavelength
so, E = ( h * c )/ wavelength = (6.63 * 10-34 J-s * 3*108 m/sec ) / ( 6.2 * 10-6 m)
= 3.2 * 10-20 J.
therefore, Energy = 3.2 * 10-20 J.