You use an electron microscope in which the matter wave associated with the electron beam has a wavelength of 0.0207 nm. What is the kinetic energy of an electron in the beam, expressed in electron volts

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

scientific laws are the result of testing theories and proving them to be facts.

resonant frequency