My little brother needs help on this worksheet. And I have no clue.
1. For waves that travel with the same speed, wavelengths increases as frequency ______.
2. Radiant energy decreases as _________ increases.
B1b. The radio waves from the ________ antenna can cause electrons in another piece of metal, such as a receiving antenna, to move up and down, creating an alternating current.
B1c. The ________ can be used to produce sound from the loudspeaker, allowing for the transmission of music, television shows, and telephone signals
B2. _______ have a higher frequency and shorter wavelengths than radio waves; they are used for some phone calls and to heat food.
B3. _______ uses electromagnetic waves to locate objects by measuring the time it takes for the waves to reach the object, be reflected, and return.
C. ________ have wavelengths between one thousandth and 0.7 millionths of a meter and feel warm and hot.
1. decreases
2. reflectivity
The answer could also be wavelength, but only in the long-wavelength limit.
B1b. transmitting
B1c. oscillations
B2. microwaves
B3. radar
C. infrared radiation (has, not have)
Thanks!
1. To understand how wavelength and frequency are related for waves that travel at the same speed, we can use the formula for wave speed: v = λf, where v represents the wave speed, λ represents the wavelength, and f represents the frequency. The formula states that the wave speed is equal to the product of wavelength and frequency. If the wave speed is constant, then the product of wavelength and frequency must also be constant.
In this case, we are given that the wave speed is the same for the waves being compared. Since we know that the wavelength and frequency are inversely proportional, we can conclude that as the frequency increases, the wavelength must decrease to maintain a constant wave speed. Therefore, for waves with the same speed, wavelengths increase as frequency decreases.
2. To determine how radiant energy changes with an increase in something, we need to understand the factors that affect radiant energy. One significant factor is the amplitude of the wave.
Radiant energy is directly proportional to the square of the wave's amplitude. So, as the amplitude increases, the radiant energy increases. Conversely, if the amplitude decreases, the radiant energy decreases.
Therefore, we can conclude that as the amplitude increases, the radiant energy decreases.
B1b. The radio waves from the ________ antenna can cause electrons in another piece of metal, such as a receiving antenna, to move up and down, creating an alternating current.
To answer this question, we need to understand how radio waves interact with metal antennas. Radio waves are a type of electromagnetic wave, and when they encounter a metal antenna, they induce a voltage in the antenna's conductor. This voltage causes the electrons in the metal to move back and forth, creating an alternating current (AC).
Therefore, the answer to this question would be the transmitting antenna.
B1c. The ________ can be used to produce sound from the loudspeaker, allowing for the transmission of music, television shows, and telephone signals.
To answer this question, we need to identify the device responsible for producing sound from a loudspeaker in order to transmit various signals.
The correct answer is the audio signal. The audio signal is an electrical signal that carries sound information, such as music, television show audio, or telephone conversations. These signals are sent to the loudspeaker, which converts the electrical energy into sound waves, allowing us to hear the transmitted information.
B2. _______ have a higher frequency and shorter wavelengths than radio waves; they are used for some phone calls and to heat food.
From the information provided, we need to identify a type of electromagnetic wave that has a higher frequency and shorter wavelengths than radio waves. Two possibilities are microwaves and infrared waves.
However, microwaves are the correct answer in this case. Microwaves have a higher frequency and shorter wavelengths compared to radio waves. They are commonly used for heating food in microwave ovens and for some phone calls, such as those made using a cell phone or satellite communication.
B3. _______ uses electromagnetic waves to locate objects by measuring the time it takes for the waves to reach the object, be reflected, and return.
To answer this question, we need to identify a technology or method that uses electromagnetic waves for the purpose of locating objects based on the time it takes for waves to travel and return.
The answer is radar, which stands for "Radio Detection and Ranging." Radar systems emit electromagnetic waves, typically radio waves or microwaves, and measure the time it takes for these waves to hit an object and bounce back. By analyzing the time and speed of these waves, radar can determine the distance, position, and speed of objects in its range.
C. ________ have wavelengths between one thousandth and 0.7 millionths of a meter and feel warm and hot.
To answer this question, we need to identify a type of electromagnetic wave with specific wavelength characteristics that correspond to it feeling warm and hot.
The answer is infrared waves. Infrared waves have wavelengths ranging from approximately one thousandth (1/1000) to 0.7 millionths (0.7/1,000,000) of a meter. These waves are associated with the sensation of warmth or heat since they are often emitted by warm objects and can be detected by our skin as a source of warmth. Infrared radiation is also used in devices such as infrared heaters and infrared cameras.