100年台灣聯合大學系統A3、A6物理學

zero

clockwise

counterclockwise

clockwise in the left side and counterclockwise in the right side

counterclockwise in the left side and clockwise in the right side

The current i is from left to right in the conductor as shown in Fig. 4. The magnetic positivefield B is upward and point S is at a higher potential than point T. The charge carriers are

positive

neutral

negative

absent

unable to be identified.

+0.66A, −0.66A

+0.5A , 0A

+1.0A, +0.5A

+0.66A , −0.5A

−0.66A , 0A

6N⋅m²/C

4N⋅m²/C

9N⋅m²/C

3N⋅m²/C

12N⋅m²/C

24.8°C

34.8°C

58.8°C

84.8°C

94.8°C

As shown in Fig. 7, a moving point source S with speed v = 20m/s heading toward the wall on the right generates sound wave with frequency 50KHz. The speed of sound in air is 340m/s. What’s the beat frequency heard at D 

2.95KHz

1.45KHz

0.50KHz

5.90KHz

8.53KHz

The average speed v and molecular diameter d of five ideal gases are given below. The number of molecules per unit volume is the same for all of them. Which gas has the greatest mean free path?

A stopping potential of 4.2V is needed for radiation whose wavelength is 200nm. The work function in eV of the

4

3

5

6

2

Polarization experiments provide evidence that

light is a longitudinal wave.

light is a stream of particles.

light is a transverse wave.

the polarized light is monochromatic.

polarized light propagates faster than un-polarized light.