Which is the correct order of the states of matter of a substance, from coldest to hottest?
a. solid, gas, liquid, plasma.
b. plasma, gas, liquid, solid.
c. gas, liquid, solid, plasma.
d. solid, liquid, gas, plasma.
e. plasma, liquid, gas, solid.
d
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If the Sun's core suddenly shrank a little bit, what would happen in the Sun?
A) The core would cool off and continue to shrink as its density increased. B) The density of the core would decrease, causing the core to cool off and expand. C) The core would heat up, causing it to radiate so much energy that it would shrink even more. D) The core would heat up, fusion rates would increase, and the core would re-expand.
The speed of light in any transparent medium is the same as the speed of light in a vacuum
a. True b. False Indicate whether the statement is true or false
When heating 2 kg of ice from –40°C, 2 kg of water from 20°C to 50°C, and 2 kg of steam from 100°C to 125°C, which requires the most energy?
a. the ice b. the water c. The steam, it's obvious since it is the hottest. d. All three take the same amount.
A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 2.8 × 1018 B) 6.9 × 1019 C) 3.4 × 1019 D) 1.1 × 1017 E) 2.2 × 1017