Question

5O. In the Bohr model of the atom when an electron goes from the n-15 state to the n-10 it A. emits photons with a number of different wavelengths. B. absorbs a photon, of a specific wavelength C. emits a photon, of a specific wavelength D. absorbs photons with a number of different wavelengths E. no photons are involved because it is just a change in the orbit of the electron ECI . The sun has a diameter of about 1.4 x 109 meters and a surface temperature of about 6000 K. It emits radiation as a black body radiator. What is the intensity of light in watts/square meter at a distance of 1.5 x 10" meters? EC2. 5.2 grams of ice at -20 deg C is added to 13 grams of water at 92 deg C. What is the final temperature of the mixture? The specific heat capacity, for water is 4.18J/g K, for ice 2.10 Jg K, Latent heat ice-water is 334 J/g EC3. A 19 mg sample a of substance of atomic mass 54 g/mol initially emits 7 x 10'° B particles per sec. Find the half-life of this substance.

Answer 1

S0 Option A is orrud na 94 EC lor blaek boday e e- enuissivi ㄐ radius 아 As Inknsity is inveusely proportional to (distonce) distane )2 T2 (al dislonte 2)

2. (0.2x10%) 7.348x10
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