A concave lens always produces a virtual image. (True or false?)

A concave lens always produces a virtual image.

Indicate whether the statement is true or false

Question 2

A 2.0- resistor is in series with a parallel combination of 4.0 , 6.0 , and 12 . What is the equivalent resistance of this combination?

A) 24
B) 12
C) 4.0
D) 1.8
E) 2.7

Question 3

If two light waves are coherent, which of the following is NOT necessary?

A) They must have the same frequency.
B) They must have the same wavelength.
C) They must have the same amplitude.
D) They must have the same velocity.
E) They must have a constant phase difference at every point in space.

Question 4

A simple pendulum consists of a 0.25-kg spherical mass attached to a massless string. When the mass is displaced slightly from its equilibrium position and released, the pendulum swings back and forth with a frequency of 2. Hz.

What frequency would have resulted if a 0.50 kg mass (same diameter sphere) had been attached to the string instead? A) 1.41 Hz
B) 2 Hz
C) 2. Hz
D) 1. Hz
E) 4. Hz

Question 5

A blackbody is a perfect emitter of the radiation it generates.

Indicate whether the statement is true or false

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A concave lens always produces a virtual image. (True or false?)

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