A jet plane travels around the world at 2 000 mi/hr (894 m/s). Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in ?s) be?
a. 0.75
b. 0.50
c. 0.25
d. 1.0
e. 0.19
e
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One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
a. the addition b. the subtraction c. the multiplication d. the division e. All the operations result in the same number of significant figures.
What is meant by separation point?
What will be an ideal response?
The principle of operation of a Geiger counter is:
a. Radiation strikes the metal coating of the Geiger tube, causing a clicking sound on impact that is amplified. b. Radiation ionizes a gas and triggers an avalanche effect of ion generation that allows a current to flow. c. Radiation is bounced back and forth from the sides of the Geiger tube, producing a signal each time it strikes the walls. d. Radiation strikes fluorescent material coating the insides of the tube, and a photoelectric cell detects the flashes of light that result. e. Radiation produces a visible track inside the Geiger tube, which is detected by a photocell.
Which of the following is not conserved?
a. lepton number c. baryon number b. meson number d. energy