Explain how astronomers find out how much energy is emitted by stars
What will be an ideal response?
Hot stars emit a great deal of ultraviolet radiation that you can't see, and cool stars emit plenty of infrared radiation. To add in the energy you can't see, astronomers make a mathematical correction that depends on the temperature of the star. With that correction, astronomers can find the total electromagnetic energy output of a star, which they refer to as its luminosity (L).Astronomers know the luminosity of the Sun because they can send satellites above Earth's atmosphere and measure the amount of energy arriving from the Sun, adding up radiation of every wavelength, including the types blocked by the atmosphere. Of course, they also know the distance from Earth to the Sun very accurately, which is necessary to calculate luminosity. The luminosity of the Sun is about 4 x 1026watts (joules per second).
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What is a planetary nebula?
What will be an ideal response?
Which of the following is the file extension for Adobe's bitmap image format?
A. .psd B. .bmp C. .jpg D. .webp
In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle ? relative to the direction of its initial velocity and body 2 at angle ?. The sine of the sum of ? and ?, sin(? + ?), is equal to
A. 0. B. 0.500. C. 0.707. D. 0.866. E. 1.00.
A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude of the magnetic force acting on the proton? (e = 1.60 × 10-19 C)
A) 8.0 × 10-15 N B) 1.3 × 10-15 N C) 0 N D) 3.9 × 10-15 N E) 2.6 × 10-15 N