What is the safest way or method to observe a solar eclipse?

a. using a telescope
b. wearing sunglasses
c. by observing with your naked eyes
d. through a pinhole projection
e. through a UV filter held up to the sky

d

Physics & Space Science

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A 300 turn coil of area 25 cm2 is placed in an 80 mT magnetic field. If the coil carries a current of 3.3 A and if the normal to the area of the coil makes an angle of 20 with the direction of the magnetic field, what is the magnitude of the torque on the coil?

A. 0.20 N·m B. 0.19 N·m C. 0.072 N·m D. 0.068 N·m E. 0.039 N·m

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Physics & Space Science

The observed composition of ordinary matter in the universe—roughly 75 percent hydrogen and 25 percent helium by mass—closely matches theoretical predictions based on the Big Bang model

Indicate whether the statement is true or false

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Physics & Space Science

Which of the following statements is NOT true about neutron stars?

a. They resist collapse with a pressure that stems from the Pauli exclusion principle. b. If the mass of the neutron star is more than 3 solar masses, it can continue to collapse and become a black hole. c. Some of the neutrons inside were formed from an electron-proton interaction. d. Neutron stars are believed to be the explanation for pulsars. e. The formation of neutron stars is a process known to absorb neutrinos.

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Physics & Space Science

Bohr's atomic theory predicted energy levels for hydrogen of En = -(2 ?2 k2 e4 m)/(hn)2. If instead we place 1 electron in "orbit" about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the En formula and why?

What will be an ideal response?

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Physics & Space Science