Explanation

If an electron transitions from n=6 to n=7, the percentage increase in radius is approximately 33%.

Explanation

In the diffraction pattern of a single slit, the central maximum or the center is usually bright.

Explanation

In Young's double-slit experiment, the central maximum or the center of the interference pattern is always bright.

Explanation

For interference of light to occur, the light must be monochromatic, meaning it consists of only one wavelength or color.

Explanation

If the source moves toward the observer, the frequency of the sound waves perceived by the observer increases due to the Doppler effect.

Explanation

If Cp = 10 and Cv = 7, then the value of the gas constant R can be calculated as the difference between the specific heats at constant pressure and constant volume: R = Cp − Cv = 10 − 7 = 3.

Explanation

If the temperature of the cold reservoir is 12°C and the temperature of the hot reservoir is 27°C, then the efficiency of the Carnot engine is: 5%.

Explanation

If the mass is doubled, both angular and linear momentum will be doubled according to the conservation of momentum principle.

Explanation

If the radius of the Earth is reduced to one-fourth of its original value, the escape velocity will be quadrupled.

Explanation

To calculate the focal length of a lens, you can use the formula: P = 1/f

Given that the power of the lens is 10 diopters, we can rearrange the formula to solve for the focal length:

f= 1/p

f= 1/10

f= 0.1m

Since 1 meter = 100 cm, the focal length in centimeters is 0.1m × 100 cm/m= 10cm.