Chemistry

Chemistry, 04.11.2019 22:31, tchase0616

What is the wavelength λ of the photon that has been released in part b? express your answer numerically in meters?

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Physics, 09.07.2019 04:30, 2sally2

Arelief airplane is delivering a food package to a group of people stranded on a very small island. the island is too small for the plane to land on, and the only way to deliver the package is by dropping it. the airplane flies horizontally with constant speed of 442km/hour at an altitude of 575m . for all parts, assume that the "island" refers to the point at a distance d from the point at which the package is released. ignore the height of this point above sea level. assume that the acceleration due to gravity is g = 9.80m/s^2 . a) after a package is ejected from the plane, how long will it take for it to reach sea level from the time it is ejected? assume that the package, like the plane, has an initial velocity of 442 km/hour in the horizontal direction. express your answer numerically in seconds. neglect air resistance. b) if the package is to land right on the island, at what horizontal distance d from the plane to the island should the package be released? express the distance numerically in meters. c) what is the speed vf of the package when it hits the ground? express your answer numerically in meters per second.

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Chemistry, 14.09.2019 10:30, ronaldo22

part a; the equation for molarity, m, is m=n/v where v is volume and n is the number of moles of solute. a certain solution has a molarity of m = 2.73 mol/l and has a volume of v = 0.650 l . what is the value of n? express your answer numerically in moles. part b; the equation for photon energy, e, is e=hcλ where h = 6.626×10−34 j⋅s (planck's constant) and c = 2.99×108 m/s (the speed of light). what is the wavelength, λ, of a photon that has an energy of e = 3.98×10−19 j ? express your answer numerically in meters. part c; the ideal gas equation is pv=nrt where p is pressure, v is volume, n is the number of moles, r is a constant, and t is temperature. you are told that a sample of gas has a pressure of p = 899 torr , a volume of v = 3280 ml, and a temperature of t = 307 k . if you use r = 8.206×10−2 l⋅atm/(k⋅mol) , which of the following conversions would be necessary before you could find the number of moles of gas, n, in this sample? check all that apply. view available hint(s) check all that apply. convert the pressure to atmospheres (atm). convert the pressure to pascals (pa). convert the volume to cubic meters (m3). convert the volume to liters (l). convert the temperature to degrees celsius (∘c). convert the temperature to degrees fahrenheit (∘f).

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Physics, 10.10.2019 05:00, justyne2004

Determine the wavelength of the photon associated with the transition in which the electron in a hydrogen atom goes from n = 6 to n = 4 a photon with a wavelength of 2694 nm is released a photon with a wavelength of 2694 nm is absorbed a photon with a wavelength of 2625 nm is absorbed a photon with a wavelength of 2533 nm is released a photon with a wavelength of 2625 nm is released

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