Show that `kWh=3.6 times 10^5 J`

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

True or false 1kWh=3.6xx10^9 J

Show that 1 J = 10^7 erges.

Show that the line segment joining the points (5,7), (3,9) and (8,6), (0,10) bisect each other.

The photoelectric threshold wavelength of a metal is 230 nm. Determine the maximum kinetic energy in joule and eV of the ejected electron from metal surface when it is exposed to a radiation of wavelength 180 nm. (Planck's constant h = 6.63 xx 10^-34 J-S, C = 3 xx 10^8 m//sec .)

Find the wave number of a photon having an energy of 2.072.eV. Given : Charge on electron = 1.6 xx 10^-19 C , Velocity-of light in air = 3 xx 10^8 m//s ,Planck's constant = 6.63 xx 10^-34 J-s .

If a light of wavelength 5000overset@ A is incident on a metal surface of work function 6 eV, emission of photoelectrons is possible or not? [h = 6.63 xx 10^-34 J-S, C = 3 xx 10^8 m//sec] .

Using method of dimensional analysis show that 1 J = 10^7 erg.

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

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