NPB 101 Lecture 26: Sensory Systems

The potential difference required to accelerate an electron fromrest to a speed of 5.00x10+6 m/s is


(a) 50.3 V (b) 71.2 V (c) 15.7 V (d) 145.3 V (e) 12.8 V

Rank these objects on the basis of their wavelength. Rank from largest to smallest.

1) baseball: v = 41 m/s

2) electron: v = 0.01c

3) person: v = 4.5 m/s

4) car: v = 27 m/s

5) proton: v = 0.01c

6) red light: v = c

If a boat takes 2 hours to go 26 km down river and 6 hours toreturn, how fast is the river going in km/hr. When I triedanswering the question and got 4.33 thinking