A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?

A) -45 cm
B) 75 cm
C) 90 cm
D) 200 cm


D

Physics & Space Science

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The frequencies needed to reproduce high-quality sounds are

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If 4.0 J of work are performed in stretching an ideal spring with a spring constant (force constant) of 2500 N/m, by what distance is the spring stretched?

A) 3.2 cm B) 3.2 m C) 0.3 cm D) 5.7 m E) 5.7 cm

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For an atom of hydrogen where the quantum number n = 3, how many possible independent configurations of the atom exist (consider principal quantum number n, angular momentum quantum number l, magnetic quantum number ml, and magnetic spin quantum number ms)?

a. 18 b. 8 c. 32 d. 26 e. infinite

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Helioseismology is the study of the differential rotation and magnetic field of the sun

Indicate whether the statement is true or false

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