Waves And Their Phenomena

The given explanation is correct. The Doppler effect refers to the change in frequency or wavelength of a wave as observed by an observer moving relative to the source of the wave. In the case of a radar gun, it emits radar waves that bounce off a moving automobile and return to the radar gun. The difference in frequency between the emitted and reflected waves is then measured, allowing the radar gun to determine the speed of the automobile based on the Doppler effect.

All mechanical waves need a medium to travel through and sound is the only mechanical wave!

Transverse wave vibrates perpendicular to the direction that the wave is traveling

In a vacuum, all electromagnetic waves have the same speed. This is known as the speed of light, denoted by the symbol "c". Regardless of their wavelength, frequency, or amplitude, electromagnetic waves will always travel at the same speed in a vacuum, which is approximately 3 x 10^8 meters per second. This fundamental property of electromagnetic waves is a key principle in physics and is a cornerstone of many theories and applications in the field.

the amount of diffraction depends upon the wavelength and size of the opening

The correct answer is "mechanical waves that require a medium for transmission." This is because a tuning fork produces sound waves, which are mechanical waves that require a medium (such as air, water, or solids) to travel through. Sound waves cannot travel through a vacuum, unlike electromagnetic waves, which can travel through a vacuum. Therefore, the sound waves produced by the oscillating tuning fork require a medium for transmission.

When a wave enters a new medium, its speed changes. This change in speed causes a corresponding change in the wavelength of the wave. Wavelength is the distance between two consecutive points on a wave that are in phase, meaning they are at the same point in their cycle. Therefore, a change in the speed of a wave as it enters a new medium produces a change in its wavelength.

When waves pass through a small opening without being diffracted, it indicates that the size of the opening is comparable to or larger than the wavelength of the waves. In this case, the waves pass through a 10 centimeter opening without diffraction, suggesting that the wavelength of the waves is much shorter than 10 centimeters.

All light waves are electromagnetic, and all electromagnetic waves are transverse

The amplitude of a wave in a rope represents the maximum displacement of the rope from its equilibrium position. Increasing the amplitude does not affect the speed of the wave, which is determined by the properties of the medium through which the wave is traveling. Therefore, the speed of the wave in the rope will remain the same.

The energy of a sound wave is most closely related to its amplitude. Amplitude refers to the maximum displacement of particles in a medium from their rest position when a sound wave passes through it. The larger the amplitude, the more energy the sound wave carries. This is because a higher amplitude means that the sound wave is causing greater disturbances in the medium, resulting in more energy being transferred.

The speed of sound in a medium depends upon the density and frequency never changes

reference table D

The swing (vibrating system) and the outside force (the girl) is acting on it causing the amplitude of the oscillations to increase. This is known as resonance

The apparent frequency will increase steadily only if the relative motion is accelerated

all electromagnetic waves travel at the same speed

The speed of a radio wave in a vacuum is 3.00 x 10^2 m/s. This is because all electromagnetic waves, including radio waves, travel at the speed of light in a vacuum, which is approximately 3.00 x 10^8 m/s.

In a vacuum, x-rays have a shorter wavelength and a shorter period compared to microwaves. This is because x-rays have higher energy and frequency than microwaves. Higher energy waves have shorter wavelengths and shorter periods.