A zoom lens is adjusted to change its focal length from 38 mm to 304 mm. If the same amount of light is to be admitted to the lens, what is the final f-number if the original f-number was 2.0?
What will be an ideal response?
16
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The period-luminosity relationship is primarily used for main-sequence stars
a. True b. False Indicate whether the statement is true or false
Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them. (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
(a) What is the capacitance of this combination? (b) What is the charge carried by each sphere? What will be an ideal response?
If the accuracy in measuring the velocity of a particle increases, the accuracy in measuring its position will
A) increase. B) decrease. C) remain the same. D) It is impossible to say since the two measurements are independent and do not affect each other.
How much heat is required to melt 5.0 kg of ice at 0°C to water at 0°C?