The energy used by a 100-watt light bulb in 1 hour is 360,000 joules
a. True
b. False
Indicate whether the statement is true or false
True
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A(n) ________ spectrum has bright lines on dark background.
A. absorption B. continuous C. emission D. None of these choices are correct.
For a diverging lens, rays that enter the lens directed along lines toward the far focal point emerge from the lens
A. Parallel to the optical axis B. Diverging from the near focal point C. Converging at the far focal point D. Diverging from the far focal point.
An object is placed 15 cm in front of a concave mirror with a focal length of 30 cm. What is the magnification?
a. 1 b. 2 c. 1/2 d. 1/4 e. ?2
Four unequal resistors are connected in a parallel with each other. Which one of the following statements is correct about this combination?
A) The equivalent resistance is less than that of the smallest resistor. B) The equivalent resistance is equal to the average of the four resistances. C) The equivalent resistance is midway between the largest and smallest resistance. D) The equivalent resistance is more than the largest resistance. E) None of the other choices is correct.