1. What is the wavelength of a low energy gamma ray (photon) with a frequency of

Question

1. What is the wavelength of a low energy gamma ray (photon) with a frequency of 5 x 10^20 Hz?

a.6 x 10^-13 m

b.8 x 10^-9 m   

c.5 x 10^-7 m

d.2 x 10^-11 m

2. A DC circuit has three emfs (3 V, 5 V, and 7 V), and three resistors (2 ohm, 4 ohm, and 6 ohm) connected as shown. There are three branches in the circuit with currents I1, I2, and I3. Assume the positive directions of these currents are as indicated by arrows in the figure. Given these assumed directions which equation is obtained from Kirchhoff's loop rule (units are A, V, and )?

a.7 4I1 5 + 6I2 = 0

b.3 + 2I3 + 5 + 6I2 = 0    

c.7 4I1 + 5 6I2 = 0

d.7 4I1 2I3 3 = 0

e.7 4I1 + 2I3 3 = 0

Explanation / Answer

Given the the gamma ray is an electro magnetic ray and its speed should be equal to that of speed of light I.e 3*10^8 m/sec and FM the equation wavelength * frequency =velocity of light we get f= 6×^-13 m and.

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