A certain X-ray tube requires a current of 5mA at a voltage of 60kv. The rate of energy dissipation (in watts) is:

Explanation

To calculate the rate of energy dissipation (power) in an X-ray tube, we use the formula P = IV, where P is the power in watts, I is the current in amperes, and V is the voltage in volts. In this case, the current is given as 5mA, which is equal to 0.005A (since 1A = 1000mA). The voltage is 60kV, which is equal to 60000V (since 1kV = 1000V).Now, substituting the values into the formula: P = 0.005A * 60000V = 300 Watts. Therefore, the correct answer is Option B: 300 watts.The other options are incorrect because:Option A (560): This value does not correspond to the correct calculation.Option C (200): This is too low for the given current and voltage.Option D (800): This is too high and does not match the calculated power.