The safest way to view an image of the Sun is to use

A) a telescope.
B) binoculars.
C) a pinhole.
D) colored sunglasses.


Answer: C

Physics & Space Science

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Standing Sound Waves: A violin with string length 32 cm and string density 1.5 g/cm resonates in its fundamental with the first overtone of a 2.0-m organ pipe with one end closed and one end open. What is the tension in the string if the speed of sound in air is 344 m/s?

A. 1000 N B. 110 N C. 450 N D. 4100 N E. 56 N

Physics & Space Science

A coil of 150 turns of wire is in the form of a circle, carries a current of 63 mA, and sits in the center of a dipole magnet that produces a uniform magnetic field of strength 1.5 T. The torque on the coil has a maximum value of 0.25 Nm. What is the radius of the coils?

A. 9.2 cm B. 13 cm C. 0.56 cm D. 7.5 cm

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The energy of an electron in the p-level of an atom is changed in the presence of a magnetic field of magnitude 4.6 T

What is the difference between the largest and smallest possible energies? (Bohr magneton = ?B = 9.27 × 10-24 J/T)

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American power plants usually supply 120 V ac

(a) At what frequency is this voltage supplied? (b) What is the maximum voltage?

Physics & Space Science