Question

1) As light travels from water to air, its speed increases. Its wavelenght would
a) increase
b) decrease
c) remain the same
d) none of the above

2) For free fall, the gain in speed for a falling rock is the same as the gian in speed for a falling ping pong ball.
a) Yes, they both get the same gain in speed during a free fall
b) No, they don't have the same gain in speed during free fall
c) None of the above

3) A converging lens has a focal lenght of 2.5 cm. An object 1 cm tall is placed 3 cm from the lens and it is upright on the principal axis of the lens.
a) On a separate sheet of paper, make a detail andto scale ray diagram. Use three light rays that orginate from the object to form an image through the lens. Indicate on the diagram, the lens, focal point, object, image, and the principal axis of the lens/
b) Using the result from part (a) determine the magnification for the lends. Explan the result.
c) Determine the image distance from the lens by using the following equation

image distance = 1 / (1 / focal lenght) - 1 / (1 / object distance )

Make a percentage difference calculation between the image distance obtained fromt he sketch in part (a) and the image distance calculated using the above formula.

4) When someone jumps from an elevated location, as he falls the potential energy decreases and kinetic energy increases per instance, which of the following statements each instance of the fall?
a) Each instance has a constant increase in time.
b) Each instance has a constant increase in (time)^2.
c) Each instance has a constant increase in velocity.
d) Each instance has a constant increase in acceleration.
f) none of the above.

Answer 1

Answer 2

1.a (f.lamda= v , as v increse lamda increse as f is constant

2) a

4 a