How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1000 W/m2?
a. 3.3 106 J
b. 3.3 J
c. 0.003 J
d. 104 J
e. 3.0 105 J
[Ques. 2] Another name for a pulsar is _______________.
a. neutron star
b. black hole
c. quasar
d. red giant
[Ques. 3] The plum pudding model of the atom is associated with
a. Bohr.
b. Rutherford.
c. Dalton.
d. Thomson.
[Ques. 4] A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
a. 8 105 W/m2
b. 8 106 W/m2
c. 3 103 W/m2
d. 0.8 W/m2
e. 2.5 105 W/m2
[Ques. 5] A Type II supernova can form a _______________ or a black hole.
a. neutron star
b. red giant
c. white dwarf
d. planet
[Ques. 6] The billiard ball model of the atom is associated with
a. Bohr.
b. Thomson.
c. Rutherford.
d. Dalton.
[Ques. 7] Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10000 m2 and the solar intensity is 1350 W/m2.
a. 0.72 N
b. 0.09 N
c. 9 N
d. 45 N
e. 0.18 N
[Ques. 8] A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a _______________.
a. singularity
b. duality
c. prominence
d. photon
[Ques. 9] Who discovered the nucleus of the atom in 1911?
a. Thomson
b. Rutherford
c. Dalton
d. Bohr
[Ques. 10] If the maximum E-component of an electromagnetic wave is 600 V/m, what is the maximum B-component?
a. 1.4 T
b. 1.8 105 T
c. 2.0 106 T
d. 1.0 103 T
e. 1.6 1010 T
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