True or False? 1. The speed of all electromagnetic waves through vacuum is equal

Question

True or False?

1. The speed of all electromagnetic waves through vacuum is equal to the reciprocal of the square
root of !o?o.

2. In an electromagnetic wave, if the magnetic field points in the -x direction and the electric field
points in the +z direction, the wave must be traveling in the +y direction.

3. In a series RLC circuit, the current is largest at resonance.

4. Just as a 100 # resistor always has the same resistance no matter what circuit it is in, likewise a
50 !F capacitor always has the same reactance no matter what circuit it is in.

5. In an oscillating LC circuit, larger values of L and C give rise to an oscillation with a higher
frequency.

6. Although the electron has an inherent spin angular momentum, this does not mean that it is
actually a spinning ball of matter.

7. If half of a radioactive substance decays in the first 10 s, the other half will decay in the next 10 s.

8. Because neutrons and protons are approximately 1837 times as massive as electrons, the strong
force acts on them approximately 1837 times as much as it acts on electrons.

9. Stable nuclei have equal numbers of protons and neutrons.

10. A compass is placed close to a stationary charge. If the charge remains stationary, the compass
will not deflect, but if the charge moves, the compass will deflect.

11. In a purely resistive AC circuit, when the voltage is at its maximum, the current is at its
maximum value as well.

12. In beta-plus decay, a proton in the nucleus is converted to a neutron, a positron, and a neutrino.

13. In an AC circuit consisting of a resistor and capacitor in series with each other, the sum of the
peak voltages across the resistor and across the capacitor must add up to the emf of the AC
source.

14. All stationary states of the hydrogen atom for which n = 4 have the same energy.

15. If a 20 kg brick is made entirely of radioactive atoms of half-life 5 days, at the end of 5 days this
brick will have a mass of 10 kg.

16. If the electric field strength produced by a point charge is 1000 N/C at 5.0 cm from this charge,
the strength will be 25,000 N/C at a point 1.0 cm closer to this charge.

17. Power loss in the transmission lines depends linearly on the current.

Explanation / Answer

1. true

2. false , maybe in -y direction

3. false

5. false

6. true

7. false

9. true

10. true

12 true

14. true

15. true

16. true

17 false

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