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A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

by Sunday | Mar 26 | Physics WAEC

A. 1600 B. 1200 C. 200 D. 2400 Correct Answer: Option A Explanation Let the count rate at zero time be N Let the count rate at zero time be N N → 3min; → 3min → N/2; N/4 → 3min = 400 → 800 →1600 =...
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

In the diagram above, a bulb is lit by drawing 2.0A from 440V a.c. source. Calculate the cost of keeping the bulb on for two days at $0.40 per kilowatt-hour.

by Sunday | Mar 24 | Physics WAEC

A. $16.90 B. $84.48 C. $1690.00 D. $8.48 Correct Answer: Option A = $16.90 Explanation Power [p] = IV → 2 * 440 = 880Watt Energy = p * t = 880 * 48hrs = 42240 or 42.24kwh But 1 kwh cost $0.40 ∴ 42.24kwh costs 42.24 x 0.40 = 16.896 or...
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

An electric pressing iron is connected to the mains using an insulated wire. wire becomes very hot. The heat generated in the wire can be minimized by replacing the wire with one of?

by Sunday | Mar 24 | Physics WAEC

A. thinner insulation. B. greater diameter. C. smaller diameter. D. thicker insulation. Correct Answer: Option B = greater diameter.
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

Which of the arrangements of radiations below shows decreasing order of wavelengths?

by Sunday | Mar 24 | Physics WAEC

A. X-rays> radio waves > infrared radiations B. Radio waves> infrared radiations > X-rays C. Infrared radiations > radio waves > X-rays D. X-rays> infrared radiations > radio waves Correct Answer: Option B = Radio waves> infrared radiations...
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

Which of the following curved surfaces will produce a real image? I. Concave mirror II. Convex mirror III. Diverging lens IV. Converging lens

by Sunday | Mar 24 | Physics WAEC

A. I and III only B. I, II and IV only C. II, III and V only D. II and IV only Correct Answer: Option D = II and IV only Explanation Convex (converging) lenses can form either real or virtual images, whereas concave (diverging) lenses can form only virtual...
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?

The sketched graph represents a progressive wave moving from the left to the right. The period the wave is 0.125s. Determine the values of the amplitude and wavelength, respectively, of the wave.

by Sunday | Mar 24 | Physics WAEC

A. 8 cm; 27 cm B. 8 cm; 9 cm C. 4 cm; 9 cm D. 16 cm; 27 cm Correct Answer: Option B = 8 cm; 9 cm
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