A 1.56 oz. Snickers bar contains 215 Calories (kcal). Convert this energy to uni

Question

A 1.56 oz. Snickers bar contains 215 Calories (kcal). Convert this energy to units of joules. What is the wavelength in nm of a photon with an energy of 8.23*10^-19J (E = hv; c = lambda v; h = 6.626 times 10^-34 Jess (Planck's Constant) and c = 2.998 times 10^8 m/s)? How many microwave photons (12 cm) are required to deliver 4.184 J of energy (E = hv; c = lambda _v; h = 6.626 times 10^-34 M Js (Planck's Constant) and c = 2.998 times 10^8 m/s)? Are quantized energy levels of atoms a consequence of an electron's partied-like or wavelike behavior. Explain briefly.

Explanation / Answer

(1) 215 cal

we know that, 1 cal = 4.184 J

then,

215 cal = 4.184 * 215 J = 899.56 J

(2)

E = h c / wave length

then,

wave length = h c / E

= 6.626 * 10-34 * 2.998 * 108 / (8.23 * 10-19)

= 2.414 * 10-17 m

= 2.414 * 10-8 nm

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