Answers: 3
Physics, 21.06.2019 21:00
A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.
Answers: 2
Physics, 22.06.2019 09:00
When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical
Answers: 2
Physics, 22.06.2019 12:30
Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
Answers: 1
Physics, 22.06.2019 16:00
The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?
Answers: 2
Particle is projected up at 10m/s from the top of a 120m hight tower taking g=10m/s a) time taken by...
History, 09.11.2020 18:20
Chemistry, 09.11.2020 18:20
Law, 09.11.2020 18:20
Geography, 09.11.2020 18:20
Mathematics, 09.11.2020 18:20
History, 09.11.2020 18:20
Mathematics, 09.11.2020 18:20
Mathematics, 09.11.2020 18:20
Mathematics, 09.11.2020 18:20
Mathematics, 09.11.2020 18:20