What must be used to maintain the optics and operation of an infrared telescope?

a. filters
b. lasers
c. coolant
d. oxygen
e. tertiary mirrors


c

Physics & Space Science

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The oldest-known smelted iron dates to approximately what year?

(a) 27,000 BCE (b) 6000 BCE (c) 2500 BCE (d) 1000 BCE

Physics & Space Science

Simple physics predicts that neutron stars should:

A) spin very slowly. B) be very cool. C) have a radius of more than 100 km. D) have strong magnetic fields.

Physics & Space Science

A 45.0-kg sample of ice is at 0.00° C. How much thermal energy is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg

A) 1.50 × 104 kJ B) 4.10 × 106 kJ C) 0.00 kJ D) 1.02 × 105 kJ

Physics & Space Science

Wet cooling towers are the most efficient way to eliminate waste heat

What will be an ideal response?

Physics & Space Science