Show that (1 kWh = `3.6 xx 10^6J`).

Show that kWh=3.6 times 10^5 J

True or false 1kWh=3.6xx10^9 J

Show that 1 J = 10^7 erges.

Show that : (9 !) / (6 ! xx 3 !) + (9 !) / (5 ! xx 4 !) = (10 !) / (4 ! xx 6 !)

The threshold wavelength for silver is 3800overset@ A . Calculate maximum kinetic energy in eV of photoelectrons emitted when ultraviolet light of wavelength 2600overset@ A falls on it. Also calculate stopping potential ( 1 eV = 1.6 xx 10^-19 J , Planck's constant = h = 6.63 xx 10^-34 Js , speed of light in vacuum = 3 xx 10^8 m//s ).

Calculate the K.E, P.E, Total energy and Binding energy of an artificial satellite of mass 2000kg orbiting at a height of 3600 km above the surface of the earth Given: G = 6.67 xx 10^-11 Nm^2//kg R= 6400 km= 6.4 xx 10^6 m M= 6 xx 10^24 kg m = 2000 kg h = 3600 km = 3.6 xx 10^6 m

An electron in the ground state jumps to 4th state by absorption of energy -13.6eV .Determine a wavelength and frequency of the photon, (e = 1.6 xx 10^-19 C, h = 6.63xx10^-34 J-s, c =3xx 10^8 m//s)

Calculate the wavelength (in nm) associated with a proton moving at 1.0 xx 10^3 m s^-1 .(Mass of proton = 1.67 xx 10^-27 kg and h = 6.63 xx 10^-34J s ).

Perform each of the following calculations. Round off your answers to three digits. (3.26 xx 10^4) (1.54 xx 10^6)

Find the energy of the electron in eV in the third Bohr orbit of the hydrogen atom. ( Rydberg's constant R = 1.097 xx10^7 m^-1 Planck's constant (h) = 6.63xx10^-34 J.S , velocity of light in air (c) = 3xx 10^8 m//s)