Physics, 13.01.2021 08:10 2020sanchezyiczela

Question 5 of 10 When dim blue light shines on a piece of metal, electrons are ejected from its
surface, but not when bright red light shines on the metal. Does this
phenomenon provide evidence for the wave model or the particle model of
light? Why?
A. The particle model, because only high-energy frequencies of light
can remove electrons
O B. The wave model, because increasing the brightness causes red
light to remove electrons
C. The wave model, because only high-energy frequencies of light
can bend around a barrier
D. The particle model, because increasing the brightness causes red
light to remove electrons

Answers: 1

Show answers

Another question on Physics

Physics, 21.06.2019 13:30

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute

Answers: 1

Answer

Physics, 21.06.2019 20:20

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

Answers: 2

Answer

Physics, 22.06.2019 10:30

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

Answers: 2

Answer

Physics, 22.06.2019 12:30

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.

Answers: 2

Answer

You know the right answer?

Question 5 of 10 When dim blue light shines on a piece of metal, electrons are ejected from its

Questions