A source of sound has an intensity I1 and when its sound level is measured at a fixed distance the value found is 70 dB. The source then has its intensity increased to I2 and when its sound level is measured at the same distance the value found is 96 dB. What is the ratio I2/I1?
a. 26 b. 400
c. 600 d. 14
b
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What distance method did Edwin Hubble use to determine the distance to local galaxies?
a. Hubble Law b. Supernova observations c. Period-luminosity relationship of variable stars d. Parallax
Potential: If it takes 50 J of energy to move 10 C of charge from point A to point B, what is the magnitude of the potential difference between points A and B?
A. 500 V B. 50 V C. 5.0 V D. 0.50 V
How much heat is required to raise the temperature of a 225-g lead ball from 15.0°C to 25.0°C? The specific heat of lead is 128 J/(kg•K)
A) 725 J B) 576 J C) 145 J D) 217 J E) 288 J
An alpha particle is moving at a speed of 5.0 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. The charge on an alpha particle is 3.2 × 10-19 C and its mass is 6.6 × 10-27 kg
(a) What is the radius of the path of the alpha particle? (b) How long does it take the alpha particle to make one complete revolution around its path?