If in a single slit diffraction experiment the wavelength is increased, which of the following happens to the diffraction pattern?
A)
The central maximum broadens.
B)
The minima remain the same.
C)
Eventually you get double slit interference.
D)
The central maximum narrows.
E)
The minima get closer together.
A
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We can learn a lot about the properties of a star by studying its spectrum. All of the following statements are true except one. Which one?
A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths. B) The total amount of light in the spectrum tells us the star's radius. C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals. D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.
Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years
A) 3 × 109 beats B) 3 × 108 beats C) 3 × 1010 beats D) 3 × 107 beats
Which of the following statements about the Moon is correct?
A. The Moon has a constant velocity. B. There is no net force acting on the Moon. C. Earth exerts a stronger force on the Moon than the Moon exerts on Earth. D. The Moon experiences a centripetal acceleration toward Earth.
A lunar vehicle is tested on Earth at a speed of 12 km/h. When it travels at the same speed on the Moon, is its momentum greater, less, or the same?