The lifetime of a ?+ meson normally is 18 nanoseconds. In a large particle accelerator, scientists can create ?+ mesons moving at speeds very close to the speed of light
What do the scientists observe when they measure the lifetime of a ?+ meson that is created at very high speed? A) The ?+ meson lasts 18 nanoseconds.
B) The ?+ meson lasts much more than 18 nanoseconds.
C) The ?+ meson lasts much less than 18 nanoseconds.
D) The ?+ meson no longer decays and remains as a stable particle.
B
You might also like to view...
Answer the following statement(s) true (T) or false (F)
1. The current flow in the wire is constant in time. 2. The current is the same for any cross-sectional area spanning the wire at any point along the wire. 3. The electric field inside the wire is zero. 4. The net charge density in the wire’s interior is zero. 5. Excess charges may be found on the wire’s surface.
What is the primary purpose of an astronomical telescope?
A) to magnify and make distant objects appear closer B) to separate light into its component colors C) to measure the intensity of light very accurately D) to access wavelengths that we cannot see visually E) to collect a lot of light and bring it to a focus
A person is lowering a bucket into a well with a constant speed. The force exerted by the rope on the bucket is
A) equal to the bucket's weight. B) greater than the bucket's weight. C) less than the bucket's weight, but not zero N. D) zero N. E) Cannot be determined without additional information.
The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes